Minor tweaks

- minor interface tweak
- added note mute when midi output is off
- added note mute when closing sonorium to avoid hung notes
Standalone object attributes

- disabled "load bang defeating" (might be useful to open sonorium
without automatically loading a preset)
- enabled "can't close top-level patcher" (people may accidentally
close sonorium' window)
Finished output interface

volume control is now done in the main window in the output tab