v6.64+dev0714 - July 14 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: enable "selecting item selects group" for all projects
+ Grouping: mouse-copy affects grouped items regardless of item selection (item grouping or track media edit grouping)
+ Razor edit: improve reassignment of item groups after split and delete in certain scenarios
+ Razor edits: preserve item grouping when cutting or deleting razor edits with ripple-all-tracks enabled
+ Track grouping: add preference (in Media Item Defaults) for media/razor edit grouping overlap requirement
+ Track grouping: mouse edits affect grouped items regardless of selection; actions affect selected items only (same behavior as item grouping)
+ Windows: improve alt-key behavior relating to menu activation and cursor updating
# Track grouping: display grouping indicators in TCP rather than arrange view
# Track grouping: display items as grouped even when selected
# Track grouping: group items if at least half of either the leader or follower item overlaps the other
# Track grouping: improve handling of actions when no items are selected [p=2576958]
# Track grouping: simplify implementation to be more like item grouping
