Downgraded MacOS player resource xibs to open in 4.6
Switched polybuild to use libarchive instead of minizip in order to (hopefully) fix creating archives that physfs reads incorrectly
Ignore parent matrix setting in getConcatenatedMatrix
Added a default Color, Specular, Emit material to default pak
Meshes won't crash if file is not found on loading
Added a setting to MaterialManager to not keep texture data in memory after uploading to video card