Merge remote-tracking branch 'refs/remotes/public/master' into toolkit

Save some todos

Set up release, add pro vocals to encore (import + ch quick)

Lefty flip 3d preview for 5-fret and 4/5/elite drums

Get ready for release today

Start QC conversion of Real Drums to Elite

More midi combine work

Continue midi file combining improvements

Smarter midi file combining

Start building an automatic 'combine 2 charts for the same song' tool

Mirror postproc effect, fixes to light/postproc state structure

Claude postproc implementations

Start setting up displaying some RB venue stuff in background

Claude waveform 7, draw over background, interpolate to fill space

Claude waveform 6 (modified), faster waveform update