Fix GL screensavers in non-direct mode.

DirectDraw is called only in direct drawing mode (BDirectWindow). Our GL
kit also works fine (but slower) in indirect mode (standard BWindow, GL
stuff rendered offscreen then blitted). However, for this to work we
need the screensavers to actually do something. Use the
BScreenSaver::Draw method, which is called in either case.

This makes it possible to use indirect mode for the preview of GL
screensavers. The performance isn't really a problem on the very small
preview (160x200 pixels).

Fixes GLife and Gravity. Flurry still crashes Mesa.

glife: Style cleanup. Spaces. No functional change.

glife: Style cleanup. Class var names. No functional change.

glife: Rename *.hpp to *.h

Fix GL screensavers in non-direct mode.

DirectDraw is called only in direct drawing mode (BDirectWindow). Our GL
kit also works fine (but slower) in indirect mode (standard BWindow, GL
stuff rendered offscreen then blitted). However, for this to work we
need the screensavers to actually do something. Use the
BScreenSaver::Draw method, which is called in either case.

This makes it possible to use indirect mode for the preview of GL
screensavers. The performance isn't really a problem on the very small
preview (160x200 pixels).

Fixes GLife and Gravity. Flurry still crashes Mesa.

glife: Style cleanup. Spaces. No functional change.

glife: Style cleanup. Class var names. No functional change.

glife: Rename *.hpp to *.h