Cleanup.
Added early-loading sequence to HUDSystem and Game.
Redesign and bugfix: Missed hook for 320x200 in SpecialRAWDimensions.
Bugfix: Crossed variables and boneheaded confusion between log2 and
sqrt.
Added beginnings of briefing screen (not yet active).
Removed try/catch block from ResourceManager.getSpecialRAWTextures() and
deferred to TR.showStopper().
Added horizontal non-square (segmented texture) support to Sprite2D.
Added TRCL Logo image to index.
Added .classpath and .project to .gitignore.