v6.57+dev0508 - May 8 2022
* Includes feature branch: improve experimental silent-track CPU reduction option to include FX tail length
* Includes feature branch: improved render loudness charts
* Includes feature branch: render individual tracks via master track using render matrix
* Includes feature branch: media item fixed lanes
* Includes feature branch: internal pin management overhaul for future extension
* Includes feature branch: media explorer user-defined tags
+ Audio Units: support kAudioUnitProperty_TailTime
+ FX: use FX tail lengths to improve experimental 'reduce CPU on silent tracks' option
+ JSFX: add ext_tail_size
+ MIDI editor: fix mouse modifier to delete touched notes when moving mouse very slowly [p=2555629]
+ ReaFIR: fix inconsistent processing of first block of audio
+ ReaPlugs: support silence-processing optimizations
+ VST: support effGetTailSize/getTailSamples