HUD
Merge branch 'develop' of https://github.com/GGProductions/LetterStorm into develop
Add boss word hint, add isEmpty boolean for testing if count of a collected letter is 0 or not, redefine HUD to show only letters that have been collected (instead of entire alphabet)
Merge branch 'develop' of https://github.com/GGProductions/LetterStorm into develop