v6.60+dev0609 - June 9 2022
* Includes feature branch: various drawing integer overflow fixes with non-sensical values [t=267310]
* Includes feature branch: fixed lane play markers
* 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
+ Batch converter: when preserving existing metadata, also attempt to convert to metadata schemes the target file format can accept [t=267540]
+ Project markers: add menu item to select marker in Region/Marker Manager; display selected markers slightly differently in ruler
+ ReaScript: fix Track/TakeFX_AddByName() matching existing instances when using FX-type prefix [t=267548]
+ Render: add support for rendering between project markers
+ Theme: hit test vol/pan/width labels [t=267524]
+ Undo: do not process deferred undo points if in the middle of a mouse edit
+ VST: improve initial size behavior with plug-ins that adjust size on editor open (Kee Bass)
+ Windows: improve alt-key behavior relating to menu activation
# Media item fixed lanes: convert destination track to fixed lanes when pasting lane play markers
# Media item fixed lanes: disable context menu "collapse lanes" action when no lanes are soloed
# Media item fixed lanes: display lane-collapse button even if displaying only one lane solo button
# Media item fixed lanes: fix restoring lane state after running action to move media items up/down one track
# Media item fixed lanes: handle pasting media items onto tracks with hidden lanes
# Media item fixed lanes: razor edits skip hidden items
# Media item fixed lanes: treat double-click on lane play region like a 2nd click, for some behaviors
