Request - Solar sensor support

[rzumer]

This is a feature request for solar sensor emulation. As far as I know this feature is only available via GBA connectivity between Boktai DS (Lunar Knights) and the three GBA Boktai games. By inserting those cartridges, the embedded solar sensor is enabled and and transmits the amount of sunlight detected to the DS game. I am not aware of any DS emulator that supports this feature, but multiple GBA emulators can handle the solar sensor signals, which may be useful.