Show both playback and user events in the event log by default.
Show event filters even without --experimental.
Eliminate excess blank space between event filter checkboxes.
Remove incorrect icons from zoom buttons.
Merge pull request #198 from kagu/fix_event_log_settings

Fix event log settings
Merge pull request #199 from kagu/remove_zoom_icons

Remove incorrect icons from zoom buttons
add icons for toolbar buttons
Merge pull request #207 from cyberixae/add_toolbar_icons

Add icons for toolbar buttons
Reset voices when resetting player state.
Reset Freeverb comb filter properly.
Implement panic functionality.
Add panic button.
Rename panic functionality to silence.
Plug in icon for the silence button.
Use tfire for pausing via the silence action.
Stop all notes explicitly on silence.
Add atomic silence operation to the audio engine.
Add remark.
Set visibility manager closing status before hiding main window on exit.
Add sheet edit mode.