* Added fast observable collection
* Updated to use 1 collection changed event per query
* Moved result updating to background thread
* Changed collapsed to hidden for virtualization
* Moved all token cancellations inside try catch
* Fixed freeze on deleting first letter
* nit fixes
* Moved update logic to plugin result loop
* Updated doc comment for AddResults function
* fix result clear on empty query
* Added functionality for left/right key navigation
* Update Behviour of left/right navigation
* Code cleanup
* Null check for results VM
* Added tests for results view model
* Update test namings