[REQUEST]Add more mappers including submappers (NES 2.0 compatible)

[TheRealHamtaro126]

Cab you please add this? Here is a list of mappers to add:

• MMC1 (1)
• UxROM (2)
• CNROM (3)
• MMC3 (4)
• FME7 (69?)
• Maybe more later.
  Submappers can be easily seen on NESDEV WIKI,

[ogamespec]

UxROM implemented in C++.