Lightweight Java Game Library Code

Added support for a new Drawable type (SharedDrawable) that shares its context with another Drawable.
Added new methods to the Drawable interface (makeCurrent, releaseContext, destroy).
Added a background thread texture loading test (using either Pbuffer or SharedDrawable).

minor tweak to XRandR class to add AccessControllers to remaining methods that need it.

2.4.2 release

fix: When using unsigned jars with signed lwjgl jars it fails when creating a Display on linux with an AccessController error. This is due to the new XRandR class missing a AccessController.doPriviledged method when it requires out of sandbox access. (LWJGL Applet Distribution is borken on linux without this fix)

prepare for 2.4.1

(possible) fix for headless environment issue with awt on linux

forcefull check of version match when building

fix infinite focus loop when using Display.setParent() + JWS + Linux.

Added @NoErrorCheck on vertex data methods.
The debug build will now track Begin/End pairs and never call GetError inside them.

Example on how to allow Space Invader Test Application to work as an applet with minimal code change.