v11.6.0

• backdate retried unlocks in rc_client
• add memory map and hash method for RC_CONSOLE_ZX_SPECTRUM
• add RC_CONSOLE_GAMECUBE to supported consoles for iso file extension
• add DTCM to RC_CONSOLE_NINTENDO_DS and RC_CONSOLE_NINTENDO_DSI memory maps
• don't report conflict if last conditions of OrNext chain conflict
• don't report conflict if last conditions of AddSource chain conflict
• fix hits not being reset on leaderboard value when start and submit are both true in a single frame
• fix crash when multiple items in a CSV lookup overlap
• fix crash if game is unloaded while activating achievements