Changes

• Fix controller presence detection in RMG-Input-GCA (thank you @EIREXE)
• Use SDL GUID in RMG-Input (thank you @bmsuseluda)
• Add mupen64plus-video-softrdp plugin (thank you @PixelMechanic0 for the suggestion)
• Update mupen64plus-core, mupen64plus-video-GLideN64, SDL_GameControllerDB and LZMA SDK