Start refactoring and testing sorting functionality.
Configure GAPI interface to skip API updates if the are self-originated.
Update 'items' to 'topics'.
Update 'activeItem' to 'activeTopicIndex'.
Add a wrapper function for functions that require GAPI to be live before being useful.
Testing written for deleting topics.
Deleting topics should work now.
Label controller tests.
It's ugly, as usual, but deleting and sorting should both work now.
Update TODO list.
Update shared state after a topic reordering has occurred.
Enable adding multiple topics at once.
Fix a small bug that caused topics to be added to the wrong side of the list.