- new object mubu.gvf - Gesture Variation Follower

pipo~:
- added active attribute to enable/disable processing

mubu:
- fixed filename arg in writetrack message
- saving in sdif file mubu tracks whitout sdif info generates an error message
- added message clearbuffers (clear all and leave one buffer with empty tracks)
- added @buffer attribute to writealltracks message
- added empty output to message gettracks when mubu has no tracks
- fixed readappend message with json files
- added options startchannel/numchannels/startframe/numframe in writetrack for audio tracks
- fixed import of mubu files with buffer names
- fixed export of mubu buffer name/info with redall in .mubu format
- added messages todict/fromdict (mubu serialisation in a dict/ mubu build from dict content)

imubu:
- fixed wrong display in Windows with high dpi scaling

mubu.play:
- fixed crash changing mubu container reference