PS Vita port, take 2.

[asiekierka]

trafficstars

All original research work originally by Spectere.

[AliceLR]

OK, this builds successfully on my end and looks good for the most part. Holding off merge for file caching in vio.c so those gnarly world.c hacks can go (SHOULD BE SOON).

[AliceLR]

Regarding vita_debug: I think stdio redirect might have had issues that necessitated this because vitasdk has FUBAR stdio. This will need testing and you might have to bring it back.

edit: NO i forgot i trashed freopen, it should be good.

[asiekierka]

TODO:

• [ ] Adding assets/config/docs files into megazeux.vpk (they are unpacked into app0:/, megazeux.vpk is literally a ZIP file you can append to in another stage of the build process)
• [x] Linux-style config (app0:/config.txt system, ux0:/data/megazeux/config.txt user)
• [x] It should probably cwd to something like ux0:/ by default for games