General:
  * Lots of artwork.
  * Lots of game logic and plot.
  * Lots of refactoring.

Specific:
  * Create icon for windows executable.
  * Make animations and description-only Things not clickable.

Cleanups:
  * Clean-up finding and loading of speech strings.
  * Move interacts out into their own module?
  * Fix thing.enter being called multiple times without leaving

Artwork:
  * Can Pipe
  * 0/1 Fixed can + 0/1/2 fixed pipes + ductape overlay images