Pass to do some cleanup

Cleanup up some warnings that appeared

Perform some maintenance/cleanup with StringUtils. Mostly just doing
some abstracting of stuff properly.

All of the places that parse controls now use ControlledString instead
of doing their own stuff. -\(o-o)/-

escapeSplit will now properly handle arbitrary length escape sequences
and do the right thing.

The main bug was that if you started the string with a delimiter, you
would only get an empty string as a result. Turns out endsWith("") is
usually true :-|

Also, added some more tests, and some more early outs to escapeSplit.