v6.64+dev0723 - July 23 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
+ Grouping matrix: add grouping specific help, accessible via the (?) button
+ Grouping: fix media item deselection with regular item groups [p=2579153]
+ Region render matrix: add region render specific help, accessible via the (?) button
+ Region render matrix: support selecting regions (for rendering selected regions) via click on region number or context menu
+ Track grouping: action to set highest-numbered media edit group to selected tracks acts as a toggle
+ Track grouping: mirror razor edit areas on envelopes to follower tracks
+ macOS: support decoding .rx2 files on native Apple Silicon
