Handle the new Python AppVars "subtypes"

[adriweb]

In addition to PYSC/PYCD, we now have:

• PYMP for "precompiled" modules. Format is unknown for now. No sure what we can extract from it. Maybe custom menu info and metadata.
• IM8C for images.

[adriweb]

Regarding PYMP format and tooling: see @commandblockguy's https://github.com/commandblockguy/tipycomp repo