REAPER v6.64+dev0721

v6.64+dev0721 - July 21 2022

* Includes feature branch: track media/razor edit grouping
* Includes feature branch: pan law/function improvements
* Includes feature branch: improve experimental silent-track CPU reduction option to include FX tail length
* Includes feature branch: media item fixed lanes
* Includes feature branch: internal pin management overhaul for future extension
+ Audio Units: fix support for AUv3 musical time/tempo/transport state callbacks
+ MIDI editor: actions to move edit cursor by grid respect snap setting
+ Render: add button to display rendered file in Media Explorer
+ Render: support forcing individual track+region combinations to mono or stereo render by right-clicking in region render matrix
+ Routing/Grouping/Render Matrix: remove "view mode" options from context menu, because dropdown is always available
# Razor edits: fix split after crossfade action [p=2579552]