Load trees asynchronously
Set isTreeLoading correctly inside doTreeLoad
Fixed async task ordering, pending actions. Typo in perfContentScript.js. Removed repetitive parts of 'init', moved it to 'createPageView' in panel-orig.js
Store parent keys in each element in JSONized object. Show bread-crumbs for parent elements in local DOM view.
Zoom out of local DOM view to last unchanged element when DOM mutation happens and local DOM root is affected.
Some concurrency updates with dom-mutation and page refresh.
Merge with Paul's PR.