Ensured briefed enemy objects are ticked at least once before being
frozen so their state is sane in BriefingScreen.
Char zero turns off CharDisplay visibility.
Made sure CharLineDisplay includes ASCII [SPACE] char 32.
Improved null checking in ProjectileBehavior and TerrainLocked.
Changed Renderer.temporarilyMakeImmediatelyVisible() to use GPU Mem
Access task pool.
Defaulted Game.playerName to DEBUG instead of null if not set by player.