Expose mapgen chunksize in on_mapgen_init callbacks
Set WM_CLASS window hint for Xorg
Fix OSX packaging finally

Signed-off-by: Craig Robbins <kde.psych@gmail.com>
Removing shared_ptr from mapblock storage
Merge remote-tracking branch 'minetest/master'

Conflicts:
	CMakeLists.txt
	src/main.cpp