allow selective definition of internal sound catalogs
Merge branch 'master' of https://github.com/SupSuper/OpenXcom into oXc_kL

Conflicts:
	Makefile.am
	src/CMakeLists.txt
	src/Engine/SoundSet.cpp
	src/OpenXcom.2010.vcxproj
	src/OpenXcom.2010.vcxproj.filters
	src/Resource/XcomResourcePack.cpp
	src/Ruleset/Ruleset.cpp
	src/Ruleset/Ruleset.h