Hotfix 18 - Customs Loading Fixes — Spin Rhythm XD Steam update #621575

Hey Spinners, This warmfix was supposed to be a quick patch to sort out a few issues we couldn’t slip into the accuracy bug hotfix, but we ended up doing a bunch of complex stuff with how customs are loaded, which took a little longer than we thought. Details below. HOTFIX 18 FIXES Custom chart loading has been greatly improved - Customs now run off a metadata cache system (the game no longer had to load each .OGG to find chart length, and load all the note data to display difficulty / radar graphs) - Loading no longer happens in 1 frame upon entering the customs menu, and should be much faster - all subsequent opens should also be much faster due to running off metadata - Sorting should be much faster - Art will load asynchronously (prioritising art closest to your currently selected track) to relieve pressure on memory - art that isn’t loaded yet will display a default artwork while lo...