REAPER v6.28+dev0430

v6.28+dev0430 - April 30 2021

* Includes feature branch: MIDI editor note reordering
* Includes feature branch: custom metadata columns in Media Explorer
* Includes feature branch: razor envelope editing
* Includes feature branch: EEL2 x86_64/SSE
* Includes feature branch: VST3 bridging
* Includes feature branch: ReaSurroundPan
* Includes feature branch: media item lanes
+ API: fix typo in documentation of IReaperUIEmbedInterface [p=2438620]
+ Project metadata: disallow spaces in IXML element identifiers
+ Ruler: add option to hide region number if region is named
+ VST3: actually support third-party embeddable UIs via IReaperUIEmbedInterface interface [t=252907]
# MIDI editor: autoscroll when reordering note rows