Support P3DZ compressed P3D files

[handsomematt]

Only used in Level 5 mission P3D.

[RolphWoggom]

This is handled by the lzr_decompress function found at 0x003281a0 in the PS2 prototype.

There's a python port available at https://github.com/RolphWoggom/shart-p3dz/blob/master/p3dz.py.