add damageType for terrain kersplosions.
Merge branch 'master' of https://github.com/SupSuper/OpenXcom into oXc_kL

Conflicts:
	src/Battlescape/BattlescapeGame.cpp
	src/Battlescape/ExplosionBState.cpp
	src/Battlescape/TileEngine.cpp
	src/Ruleset/MapData.cpp
	src/Ruleset/MapData.h
	src/Savegame/Tile.cpp
	src/Savegame/Tile.h