Re-fix hud_change stat argument retrieval

Conflicts:
	src/script/lua_api/l_object.cpp
Add curl, freetype and luaJIT to CMAKE_BUILD_INFO
Lower the default max_users from 100 to 15
Show git hash in version string at top left corner of window
Remove doc/gpl-2.0.txt, add doc/lgpl-2.1.txt
Add --version option