REAPER v6.47rc3

v6.47rc3 - February 9 2022

* Includes feature branch: render internals simplification/cleanup
* Includes feature branch: user-defined action overhaul
* Includes feature branch: media explorer toolbar
+ Metadata: fix encoding of long/complex metadata strings in projects [p=2522469]
+ Razor edits: fix setting envelope point shape to linear on toggle envelopes [p=2525258]
+ Render: fix reset of normalization mode/channel count when undoing certain actions (6.43 regression) [t=262585]