bunch of stuff.

update DIGITS.PNG
put pilot on the plane

Xcom1Ruleset: remove Auto from Heavy Plasma
	- new string for prime in Inventory
BattlescapeGame: remove targetting cursor if no ammo
	- setupCursor() no matter what; cursor was sticking
	again after shot, if mouse gets moved during animation
BattlescapeGenerator: base Defenses can kill up to half the aliens
	before a Base Defense mission.
BattlescapeState.h: speed up DEFAULT_ANIM_SPEED for 4xHQX filter
InventoryState: show "prime" TU for grenades.
Map: smooth the smooth camera even more. Use getFinalTarget()
	- touchups on wounded rankIcon. Use the small scanG cross
MedikitState: center text vertically
Projectile: try to normalize throwing accuracy
	- new function, getFinalTrajectory()
TileEngine::tryReactionSnap()
	- check for ammo & TU before allowing each reaction shot
UnitDieBState: remove check for TurnsExposed before setting it to 255.
BaseDefenseState: set the damage that baseDefense does to
	the incoming assault UFO
GeoscapeState: simplify DD MM YY display.
Window: speed up popups for high quality graphic filters
Base: new functions, get/setDefenseEffect()
BattleUnit: tweak bonusReaction exp for shooting aLiens.