[Request] Support zip0 format and endian-ness conversion

[wertercatt]

The Xbox 360, PS3, NVIDIA Shield, and Switch ports of Source Engine games use a modified zip format called zip0, which would be useful to access via srctools. An existing, but buggy, tool for it can be found at https://github.com/CRACKbomber/Source360 for reference.

The Xbox 360 and PS3 versions also reportedly convert several of their files to little endian. It'd be great if this conversion could be reversed, to allow for easier comparison of game data with their PC equivalents.

Edit: The NVIDIA Lightworks ports use standard zip files.

[TeamSpen210]

That would be a welcome thing to have, though I don't do anything with console so I'm not sure where to get test files and whatnot. For the byteswap, that's easy to to do (swap < with > in all the structs), but again I'd need to test.