basic toolbar setup
Setting up the right toolbar.
Registering commands on the ace toolbar
Toolbar hooks
Moving the toolbar plugin calls.
Adding settings.json.template example for the toolbar.
Normalizing how select and button commands are triggered.
passing the ToolbarItem to the callback
Merge branch 'pr/1579' into toolbar-test

Conflicts:
	settings.json.template
	src/static/js/pad_editbar.js
Toolbar: Allow custom dropdowns for plugins
Refactor toolbar.js to use consistent naming
Add docs for toolbar controller and pad_editbar
Merge pull request #2110 from ether/modularize-toolbar

Modularize toolbar