REAPER v6.29rc5

v6.29rc5 - May 12 2021

* Includes feature branch: custom metadata columns in Media Explorer
* Includes feature branch: razor envelope editing
* Includes feature branch: ReaSurroundPan
+ JSFX: allow export_buffer_to_project() to use 64 channels
+ Notation view: assign current voice when inserting notes via "insert note at nearest X" actions [t=216159]
# Razor edit: fix trim-behind behavior [p=2443104]