* Move StratagusMajorVersion, StratagusMinorVersion, StratagusPatchLevel and StratagusPatchLevel2 to CMakeLists.txt
* Added tool genversion.cpp which (re)generate file version-generated.h from cmake if needed
* Fill VERSION macro from other values with C preprocessor instead hardcoded values
* Remove macros StratagusFormatString and StratagusFormatArgs from code, use only VERSION