Changes in UI to add filter button
Add myRooms parameter in roomselector widget
Add myRooms parameter
Implement action of "Show only my rooms"

If the room id exists in the myRooms array, then
add the class "room-not-mine" to the room row.
The "Show only my rooms" button will hide all
rows with such a class name.
Cleanup and add comments
Refactoring code
Fix mistake with clearableinput
CSS fix for padding of dropdown list item
Add highlighting when a filter is active
UI fixes for filter button