We have enzymes

Many elements implemented: player can now change to DNA sequences to optimize amino acid yield. Amino acid resources are shown on screen and translation now cycles. I tried moving to a monospace font but not sure I succeeded, still issues with properly aligning elements on screen. Also implemented the ability to buy enzymes that will then metabolize their substrate.

My main concern currently is whether the game mechanic really makes sense and leads to a fun game. Will need to get a version ready for my friends and family to test play.

Tasks:

* urgently fix slecting position on DNA issue with sampling rate of key-press events.

* prettify UI