v1.6.4.3 update: for internal testing

This v1.6.4.3 update fixed adjusted some things based on internal testing feedback and to facilitate better internal testing in the next few weeks. 

(1) UX: more complete explanations for "i" and "d" labels, more text guidance for next steps to complete the game

(2) Mechanics: new game over mechanism --> no game overs, just cutscene when player runs out of ink.

(3) Analytics: tracked ink (i.e. number of times player adjusts punctuation in a level) should now include negative. Since it starts at 8, the number should allow extrapolation of how many attempts it took the player to find the correct punctuation combination for a level.

(4) Audio: new fanfare music clips for saving and loading.