Archives: Implemented ExtSaveData and SharedExtSaveData

They will be stored in /extsavedata/SDMC and /extsavedata/NAND respectively.
Also redirect some APT_A functions to their APT_U equivalents.
Implemented the gamecoin.dat file in SharedExtSaveData in the PTM module.
Implemented formatting the savegame.
Retake a previous savegame if it exists instead of reporting them as not formatted every time a game is loaded.

This allows several games to boot further
I'm honestly a bit troubled by this proliferation of paths for NAND stuff. Since you're not following the real NAND layout and format for the files can you at least put all related stuff in a subdirectory?