Package daemon notifications

* Sentence casing
* Localize notification texts in the package kit
* Have "Package daemon" as group name and "Warning" as title
* Use ::BPrivate in Bitmap.h to solve an ambiguity (as pointed out
by PulkoMandy). Though not needed for my changes any more, since
a the icon of the notifying app is now shown by default.

Fixes #13590.

Add localization to package daemon and solver

Thanks to Adrien and Rene for reviewing and guidance.
Fixes #13282.

Use libstdc++, libsupc++ and libgcc from gcc_syslibs.

* Instead of faking libstdc++.so from libstdc++.a, use libstdc++.so
from the gcc_syslibs build feature for everything except x86_gcc2.
* Use libgcc_s.so from the gcc_syslibs build feature for everything but
x86_gcc2 (which still carries libgcc as part of libroot.so).
* Drop filtering of libgcc objects for libroot, as that is no longer
necessary since we're only using libgcc-as-single-object for libroot
with x86_gcc2, where the filtered object file doesn't exist. Should
the objects that used to be filtered cause any problems as part of
libgcc_s.so, we can always filter them as part of the gcc build.
* Use libsupc++.so from the gcc_syslibs build feature for everything but
x86_gcc2.
* Adjust all Jamfiles accordingly.
* Deactivate building of faked libstdc++.so for non-x86-gcc2. For
x86_gcc2, we still build libstdc++.so from the sources in the Haiku
source tree as part of the Haiku build .
* Put gcc_syslibs package onto the image, when needed.

package daemon: Initial old packages state support

* VolumeState: Move locking to Volume.
* Package: Pull the file related functionality into new class
PackageFile. A Package refers to a PackageFile. A PackageFile can be
referenced by multiple Packages. PackageFiles are managed by the new
PackageFileManager.
* CommitTransactionHandler: Clone the passed volume state.
* Volume now manages two VolumeStates: A state reflecting the currently
active packages and the latest state (i.e. the one reflecting the
situation of the packages directory). Usually the two are the same,
unless an old state has been booted.
* The client interface hasn't been adjusted yet. Clients only see the
latest state.

Move Volume::CommitTransactionHandler to top level

Also move constant definitions to Constants.h/cpp.

package daemon: Move Volume::State to top level

... and rename it to VolumeState.

package daemon: Implement writable files handling

* Move Volume::Exception to top level and into own files.
* Add utility class FSUtils, move Volume::RelativePath there and add a
bunch of FS utility functionality.
* Add FSTransaction, a helper class to record FS operations and revert
them.
* When activating a package we now extract the writable
files/directories it declares. The handling is not quite complete:
- We don't handle merges yet. I.e. the user will have to do that
manually for now.
- We don't propagate issues/infos regarding the writable files (e.g.
that a manual intervention is required) to the user yet.

package daemon: Replace changes alert by a window

package daemon: ProblemWindow: Use a scroll view

package daemon: Implement dependency resolution support

... for package changes performed manually by the user (i.e.
adding/removing files in a packages directory). Currently only done for
the system root. Alternative roots should still work as before, so this
shouldn't affect haikuporter (not tested yet).

Needs some more work (e.g. the GUI part).

package daemon: Properly qualify private package headers

... instead of adding the private package header directory to the
include paths.

package daemon: Make all work with the packages asynchronous

There's now a worker thread per Root that does all the work that can
take time. Node monitoring notifications received in the main thread are
just pushed into the worker's job queue, so the application looper
remains responsive.

package daemon: Add package monitoring and de-/activation

* packagefs: Disable (comment out) node monitoring of the packages
directory.
* package daemon:
- When a packagefs volume is added load the respective packages
directory and get from the volume which of the packages are
activated.
- Add node monitoring for the packages directory and
activate/deactivate packages as packages are added/removed.

Add the humble beginnings of the package daemon

It doesn't really do anything yet save for tracking what packagefs
volumes are mounted and unmounted.

Use libstdc++, libsupc++ and libgcc from gcc_syslibs.

* Instead of faking libstdc++.so from libstdc++.a, use libstdc++.so
from the gcc_syslibs build feature for everything except x86_gcc2.
* Use libgcc_s.so from the gcc_syslibs build feature for everything but
x86_gcc2 (which still carries libgcc as part of libroot.so).
* Drop filtering of libgcc objects for libroot, as that is no longer
necessary since we're only using libgcc-as-single-object for libroot
with x86_gcc2, where the filtered object file doesn't exist. Should
the objects that used to be filtered cause any problems as part of
libgcc_s.so, we can always filter them as part of the gcc build.
* Use libsupc++.so from the gcc_syslibs build feature for everything but
x86_gcc2.
* Adjust all Jamfiles accordingly.
* Deactivate building of faked libstdc++.so for non-x86-gcc2. For
x86_gcc2, we still build libstdc++.so from the sources in the Haiku
source tree as part of the Haiku build .
* Put gcc_syslibs package onto the image, when needed.

package daemon: Initial old packages state support

* VolumeState: Move locking to Volume.
* Package: Pull the file related functionality into new class
PackageFile. A Package refers to a PackageFile. A PackageFile can be
referenced by multiple Packages. PackageFiles are managed by the new
PackageFileManager.
* CommitTransactionHandler: Clone the passed volume state.
* Volume now manages two VolumeStates: A state reflecting the currently
active packages and the latest state (i.e. the one reflecting the
situation of the packages directory). Usually the two are the same,
unless an old state has been booted.
* The client interface hasn't been adjusted yet. Clients only see the
latest state.

Move Volume::CommitTransactionHandler to top level

Also move constant definitions to Constants.h/cpp.

package daemon: Move Volume::State to top level

... and rename it to VolumeState.

package daemon: Implement writable files handling

* Move Volume::Exception to top level and into own files.
* Add utility class FSUtils, move Volume::RelativePath there and add a
bunch of FS utility functionality.
* Add FSTransaction, a helper class to record FS operations and revert
them.
* When activating a package we now extract the writable
files/directories it declares. The handling is not quite complete:
- We don't handle merges yet. I.e. the user will have to do that
manually for now.
- We don't propagate issues/infos regarding the writable files (e.g.
that a manual intervention is required) to the user yet.

package daemon: Replace changes alert by a window

package daemon: ProblemWindow: Use a scroll view

package daemon: Implement dependency resolution support

... for package changes performed manually by the user (i.e.
adding/removing files in a packages directory). Currently only done for
the system root. Alternative roots should still work as before, so this
shouldn't affect haikuporter (not tested yet).

Needs some more work (e.g. the GUI part).

package daemon: Properly qualify private package headers

... instead of adding the private package header directory to the
include paths.

package daemon: Make all work with the packages asynchronous

There's now a worker thread per Root that does all the work that can
take time. Node monitoring notifications received in the main thread are
just pushed into the worker's job queue, so the application looper
remains responsive.

package daemon: Add package monitoring and de-/activation

* packagefs: Disable (comment out) node monitoring of the packages
directory.
* package daemon:
- When a packagefs volume is added load the respective packages
directory and get from the volume which of the packages are
activated.
- Add node monitoring for the packages directory and
activate/deactivate packages as packages are added/removed.

Add the humble beginnings of the package daemon

It doesn't really do anything yet save for tracking what packagefs
volumes are mounted and unmounted.