* fixes#3008 and #3009
* fixed code to only call reload data once
* if itemsource is set to null then just null out CVS otherwise it'll cause a COM Exception
* added ListView Categories to some tests to more easily run targeted tests against UWP
* fixed a couple UWP tests that weren't passing
* * fixes#3018
* fixes#3019
* fixes#2996
* The wrong object was being added to the internal collection
* * add test case for listview initailized as null
Shane Neuville