v6.64+dev0716 - July 16 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
+ Media explorer: support typing in preview volume
# Track grouping: group items only if the leader item fully encloses the follower item
# Track grouping: if contiguous leader items are selected, consider them a single item when calculating followers
