Layout selection and show/hide frame

Added ability to show/hide object frames via a toggle button in the
edit toolbar. All objects have frames by default except for ‘hyperlinks’.
Also, implemented object selection in the layout and added tests for new features.

Fixes #1658.

platform/commonUI/general/res/sass/controls/_controls.scss

@@ -704,11 +704,6 @@ textarea {
     }
 }
 
-.view-switcher,
-.t-btn-view-large {
-    @include trans-prop-nice-fade($controlFadeMs);
-}
-
 /******************************************************** BROWSER ELEMENTS */
 body.desktop {
     ::-webkit-scrollbar {