improve documentation

MAbstractElement
sending output values
elementAt shortcut for getting element
Clean up the code for sending values back to the device

we now use value_  for that
almost functional description file for EOWave ribbon
add a bend post message
Merge branch 'origin/tillBergen'
resolved minor naming issue
fix MIDIMKtl note responders
MIDIExplorer first round.
add that teenage thang
Merge branch 'origin/adc_bergen13'
Merge branch 'origin/tillBergen'
hidmktl : update to use new hid backend
Merge branch 'marijeBergen13' of github.com:ModalityTeam/Modality-toolkit into marijeBergen13