Add empty instrument editing window.
Modify init procedure of instrument edit views.
Add instrument name editing support.
Make style more consistent.
Revert instrument view init procedure back to original approach.
Hide instrument edit button unless in experimental mode.
Fix default global force of instruments.
Make default instrument header value more useful.
Add global volume accessors to instrument objects.
Add global force slider to instrument editor.
Merge pull request #271 from kagu/instrument_window

Instrument window