Add Ninja Model support

[krogenth]

Currently some code to handle models is written, however the handling of strips to be drawn has not been added.

Research into how model strips work will be needed.

The known sections within the files around models and their motions are:

• CDDH(header for NJCM list?)
• NJCM(model)
• NMDM(model motion)
• POF0(offset/pointer type)
• MCS_(unknown)
• GPHD(header for NMDM list?)
• MIXL(listing for model motions)
• GAMT(unknown)

potentially helpful links:

• pioneer2 PSO discussion
• Github bogglez/Ninja-Lib doc on NJ format
• A NJCM parser from Mykaruga in Visual Basic

Tasks:

• [ ] add support for parsing the njcm(model) file format
• [ ] add support for parsing the nmdm(model motion) file format
• [ ] add support for parsing entire *.chr, *.chr2, and *.mjn(map) files