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
Allow to manually specify param2 in minetest.item_place() and return success
Add set_name(), set_count(), set_wear() and set_metadata() to Lua ItemStack
Pass VERSION_EXTRA to GenerateVersion.cmake