Issue #2162407 by jibran: Split up toolbar.js.

core/modules/toolbar/js/models/MenuModel.js

core/modules/toolbar/js/models/ToolbarModel.js

core/modules/toolbar/js/toolbar.js

core/modules/toolbar/js/views/BodyVisualView.js

core/modules/toolbar/js/views/MenuVisualView.js

core/modules/toolbar/js/views/ToolbarAuralView.js

core/modules/toolbar/js/views/ToolbarVisualView.js

core/modules/toolbar/toolbar.module