sFx & gFx changes

Music rule: add aLienTurn
pseudoLoop 12tactic.ogg

BigObs, laser rifle: move up 1p
cybam, disc: remove eyes ...

BattlescapeState: use terrain if appl.
BriefingState: remove superfluous include & tidy
Map: varname changes + change color of overLoaded indicator
NextTurnState: switch Music for xCom/aLien turns
	- varname change: _battleGame to _savedBattle
Projectile: increase throwing acu.
ConfirmCydoniaState: add fadeMusic()
ConfirmLandingState: add fadeMusic()
ResourcePack: varname change, set to soundSet
XcomResourcePack: add constant resource string
	- MUSIC_TAC_BATTLE_ALIENTURN