Changes against v1.3.5:
- migrated to Python 3 and PyQt5
- fixed various minor issues
- simplified GUI
- fixed downloading pre-release update even though Stable update channel was selected
- fixed error when updater launched Woofer
- media adding stopped immediately, woofer now handle new media adding event when some media adding is already being processed
- save and load playlist menu items hidden
- inactive updater setting hidden
- enable/disable save/load session functionality