Config changes now persist
Config changes now persist

1. Config changes are now saved and persist across sessions
2. Focus is requested on closing the settings menu
3. Default selected letter color is changed
4. Groundwork is set for rebus puzzles (though rebus puzzles are still
not supported)

boisvert42/html5-crossword-solver,crosswordnexus/html5-crossword-solver,boisvert42/html5-crossword-solver,crosswordnexus/html5-crossword-solver