Hotfix 19 - Background optimisation — Spin Rhythm XD Steam update #621574

Hey Spinners, This is the last part of our recent “warm fixes” (small updates) after our accuracy update. In our next larger update we want to improve the tutorial and calibration tools among other things. David will be moving interstate so we may have a brief hiatus on updates (he will be out of action for two weeks). Details below. HOTFIX 19 FIXES Backgrounds can now be scaled to low, medium and high quality - this affects the number of segments in the floor of the background - which aims to improve performance on lower end machines Customs metadata should reload more frequently (specifically when changing a track’s difficulty rating, and enabling / disabling difficulties) Hitting the beat button after the last note in a track will no longer remove a PFC / FC New players will now be prompted to play the Easy tutor...