USB2SNES updates to sd2snes 1.10.3 firmware
Merged with 1.10.3. Applies over official 1.10.3: https://sd2snes.de/blog/downloads.
Added SD2SNES Pro support.
Merged with 1.10.3. Applies over official 1.10.3: https://sd2snes.de/blog/downloads.
Added SD2SNES Pro support.