[Logic] Cheats | APU enhancement | BSRAM save/load - PAL - 1:1/8:7 aspect ratio support

[fjpolo]

Add support for BSRAM save/load ❌ (WIP) Add PAL support ✔ Add 1:1/8:7 aspect ratio support ✔

[APU] Improved R2A03 APU’s triangle wave and made its mixer linear ✔ Improved mapper VRC6’s sawtooth wave. Mixer is already linear ✔

[VRC6] Added mapper. Tested on Castlevania III (Japan). Needs more testing ✔

[Mapper4/69] Disabled APU Enhancement because volume levels saturate ✔

[Cheats]

• Add support for 4 cheats ✔

Firmware

[fjpolo]

RV not loading OSD Key is fixed. Only WIP is BSRAM save/load for NES