NSM: Specify window class for NSM-Proxy GUI.
Tweak colors.
Make sure that every highest peak value is drawn

As process is usually called more often than
update_cb, we should store the highest peak
value until it is consumed by update_cb.
Mixer: Fix resize issues with JACK module connection display list.
Timeline: Add script to convert Ardour session to Non-Timeline format.
Timeline: Make ardour session importer work with ardour1 files. Also, don't fail if sample-rate is not specified.
Timeline: Update ardour session importer to work with ardour3 sessions.
Timeline: Ardour input script now merges sources for multi-channel tracks instead of creating multiple mono tracks.
TImeline: Add GUI for Ardour session import and corresponding menu entry.
Timeline: Don't allow import attempt when no project is loaded.
Timeline: Tweak crossfade appearance.
Timeline: Fix peak display while recording.
Timeline: Add freewheel button.
Mixer: Clean up some issues with display of JACK connection lists.
Mixer: Don't process (dis)connection notifications from JACK while destroying chain.
NSM/jackpatch: Rebuild patch network upon NSM save.
NSM: Command all unneeded 'switch' capable clients to exit when switching sessions.

Closes #60.
NTK: Don't keep unneeded clients in session when switching.
wscript: Fix for Python3.
FL/New_Project_Dialog: Don't crash if aborted.