Irem M72 arcade core updated

Irem M72 core for the MiSTer FPGA got updated with the following fixes:

– Hiscore saving is now supported (implemented by zakk4223, thanks zakk!)
– Fix for Image Fight stage completion percentage calculations
– MRAs added for Air Duel (World, M72 hardware) and Daiku no Gensan (Japan, M84 hardware) (thanks wwark)
– MRA updates by Toy-a and Schermobianco

Run update_all script to get the latest version of Irem M72.