#228 Feature Request: Add mididings scripting capability at startup

[Bruce]

Add a "Run mididings script" options to the General tab of the View/Options menu and (optionally) a checkbox to automatically connect the output of mididings to Qtractor. If a file is specified, and it exists, spawn a mididings process using QProcess that runs the file. This will allow the user to connect various MIDI controller hardware to Qtractor via a script.

Long term, it would be nice if a repository of user contributed translations scripts for various MIDI controllers could be added to the distribution.