Tracker: Remove Trash settings remnants

PoseView.cpp changes
* Create DoDelete() and DoMoveToTrash() convenience methods in BPoseView.
- Call DoMoveToTrash() in B_DELETE handler checking Shift.

Tracker: Update Delete warning dialog

This dialog pops up when you Move to Trash with Shift held down.

The Skip Trash version has been deleted since we've decided to
no longer using this settings.

Push Cancel button over to right on the "Delete files" version.

Handle default case in switches so that a weird value is returned it
will Cancel. If BAlert receives B_QUIT_REQUESTED it returns -1 for
example according to the Haiku Book so make sure to handle this case.

Add B_CLOSE_ON_ESCAPE flag and handle that case.

Change-Id: I16c532bfef585081207f1df3edc93f69dec6e529
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7199
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

Tracker: Refactor Default settings to be in one place

Create TrackerDefaults.h to share default setting values between
TrackerSettings.cpp and SettingsView.cpp instead of duplicating
the default value in both places.

There is now one source of truth if we ever want to change a
setting it won't cause regressions to the Defaults and Revert
button state.

TODO Does not yet include Disk auto-mount settings.

Add HideDotFiles to the defaultable list for Windows settings
and make its default false (was true in some places).

Fix issues with the Defaults button not enabling Enable type-
ahead filtering and Generate image thumbnails as it should.

Move default color constants to TrackerDefaults.h, remove TODO.
Rename kSpaceBarAlpha to kDefaultSpaceBarAlpha matching rest.
Create RGBTOHEX(c) macro to convert rgb_color to a (hex) number
for HexScalarValue to set the default space bar colors.

Saving these old hex values in the commit message:
UsedSpaceColor: 0xc000cb00
FreeSpaceColor: 0xc0ffffff
WarningSpaceColor: 0xc0cb0000

Reorder setting to match display order.

I've gone way over 80 in TrackerSettings and SettingsViews due
to long variable names.

Change-Id: Iafd6dfc5e738562d73967558e1f151fc7fed5866
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7196
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>