Created new branch with redesigned feedback system.

Now it should fully support OMNI mode and various MIDI signalling
Handle MIDI Program Change output mode
Fixed MIDI channel masking when converting into feedback
Fix small MacOS compilation error.
Merge pull request #167 from joepadmiraal/midi_omni

Fix small MacOS compilation error.
Updated MIDI docs
Merge branch 'midi_omni' of github.com:mcallegari/qlcplus into midi_omni
Changed maximum input channel number from 512 to 65535
Merge pull request #168 from joepadmiraal/midi_omni

Changed maximum input channel number from 512 to 65535