Lock views and prevent editing (#3094)

* working lock and unlock

* prevent flexible layout drop hints from showing

* fix lint issue

* wip

* disable mousedown when not editing in DisplayLayout

* continued wip

* Cherrypick new glyphs from add-new-glyphs-062320

* More new glyphs, updated art

- New glyphs: icon-unlocked and icon-target;
- Updated art for icon-lock glyph;

* Edit toggle refinements WIP

- Markup, CSS in BrowseBar.vue;

* More new glyphs, updated art

- New glyphs: icon-unlocked and icon-target;
- Updated art for icon-lock glyph;

* Edit toggle refinements

- Replaced toggle switch with button;

* prevent styling changes when locked

* fix lint issues

* fix tests

* make reviewer suggested changes

Co-authored-by: charlesh88 <charlesh88@gmail.com>

src/plugins/displayLayout/DisplayLayoutToolbar.js

@@ -596,7 +596,7 @@ define(['lodash'], function (_) {
                     let selectedParent = selectionPath[1].context.item;
                     let layoutItem = selectionPath[0].context.layoutItem;
 
-                    if (!layoutItem) {
+                    if (!layoutItem || selectedParent.locked) {
                         return;
                     }