Add save states

[Spegs21]

On going save state implementation per @Exzap comments in #898

Initial work based on this fork.

• Every PPC thread and it's current thread context (OSThread_t struct)
• Full RAM dump
• All of the CafeOS modules and drivers need their own load/store
  • coreinit
• All of the IOSU modules
  • fsa
• Dynamic textures which only resides in VRAM and cant be restored from a RAM dump alone
• The vertex and uniform cache because it can hold information that isn't synced back to RAM
• Various settings:
  • current graphic packs configuration
  • controller config
  • renderer settings
• Pause & resume emulation feature (not sure about the implementation of this one)

[amayra]

did this RP get dropped ?

[mitch03]

I hope we can get save states! would be awesome!!