REAPER v6.64+dev0715

v6.64+dev0715 - July 15 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 items: double-click to reset select item volume affects all selected items
+ Track grouping: add actions to create track media/razor editing group from selected tracks, or remove selected tracks from group
# Razor edit: fix removing items behind razor edits
# Track grouping: apply transitively (selecting any item in a group results in the same set of items being grouped)
# Track grouping: remove configurable track grouping overlap tolerance, hardwire to 75%
# Track grouping: respect preference to not display track grouping indicators
# Track grouping: update media/razor edit grouping display after changing display preference