always show composition view
reorganize layout
Merge pull request #194 from cyberixae/remove_splitter

Remove splitter
Add trigger insertion support to column.
Add trigger insertion support to the sheet manager.
Add button for rest insertion to the sheet toolbar.
Add keyboard shortcut to rest insertion.
Resolve trigger removal target in sheet manager.
Fix crash when Note On/Off is encountered without a preceding Set Control event.
Check against emitting new signals while performing updates.
Make selection always return a location.
Remove selection modification when syncing patterns, fix rendering of empty sheet.
Merge pull request #196 from kagu/add_rest2

Add rest
Fix function naming.
Merge pull request #197 from kagu/fix_signal_updates

Fix signal updates