Digitron Synthesizer

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- added velocity keyboard output (onscreen keyboard, midi and sequencer)
- added mod input to vca
- sync sequencer with midi clock and start/stop commands
- new midi settings ui
- fixed midi implementation(reacts on zero velocity noteOn commands as noteOff)
- changed patchbay disconnect behavior
- scale lfo led to 0 to 1 and added lowpass filter
- reconnect midi keyboard after restart
- fixed how sequencer quantizes notes
- other bug fixes and usability improvements