Rack Performer

This update adds many work-flow improvements and some corrections.

Multi-monitor support has been improved by making all dialogs positions more consistent (as there was quite a bit of wasteful back and forth movement required) The main menu can now be assigned to any monitor by just placing the application window at the correct location before entering "Edit" mode. A few other edge-cases were also solved.

Mapping presets and scene snapshots to standard (7bit CC) MIDI controllers is now straight-forward with a 1:1 mapping by default. But it is also possible to span the controller to a smaller range of values by lowering the presets port upper bound, making the control less sensitive. This can be useful when any module has only a few presets in use during the performance.

To align precisely the latencies of external MIDI gears controlled by the application, a new control port has been added to the special module to delay all MIDI events by a fixed time (i.e. output offset) By default all MIDI output events are sent slightly before the audio, to give the controlled gear enough time to process the commands and generate sound. Depending on the current application audio latency and the controlled MIDI gear(s) latencie(s) as well as the routing scheme in place (OTB or internal loopback mix etc) it might be necessary to set the output offsets (per MIDI gear) to get the phasing right.

Many other details and fixes were added.