Changes:
- A lot of refactoring was done to streamline adding new mappers.
- Fixed several issues with input handling
- Added controller support
- Added Save/SRAM file headers and versions
- Fixed issues with aspect ratio, resizing, and fullscreen support
- Added extra options for Concurrent D-PAD experimentation (disabled by default), RAM randomization, and CPU logging
- Added logo and window icon
- Added AxROM mapper