Added a flip tile for the filter on the issues list sidebar.
User is now able to filter issues using the new filter flip tile.
User now sees the list of filters before flipping the sidebar tile via the filter link. If all items in a filter category are selected, those items are not listed under the filter trigger.
Inverted filter. If no filters are selected, all issues are shown. Replaces behavior before, where all filters were initially selected.
User can now remove set filters by clicking on them.