underwater smoke
fire is hard to move through underwater

don't ask me, it just is.
merge + stuff

fix TileEngine::validateThrow()
MCD & png edits
fix rulesets re. inv width / height
fix Scoutdrone hit animation CTD
Projectile: increase Throw accuracy.

Merge branch 'master' of https://github.com/SupSuper/OpenXcom into oXc_kL
Conflicts:
	src/Battlescape/Map.cpp
	src/Battlescape/Pathfinding.cpp
	src/Resource/ResourcePack.cpp
	src/Resource/ResourcePack.h
	src/Ruleset/Ruleset.cpp