Missing functions
Merge branch 'master' of https://github.com/wireclub/fs3d

Conflicts:
	fs3d/mat3d.fs
	fs3d/mat3f.fs
	fs3d/mat4d.fs
	fs3d/mat4f.fs
Merge branch 'master' of https://github.com/wireclub/fs3d
Use stack allocation for Mat4.invert
Merge branch 'master' of https://github.com/wireclub/fs3d