Removed references to smash mode - rendered mode-selection button
inactive (will remove when can be bothered updating all the buttons
array references).

Fixed counter-rotation - box2d measures angle oppositely to Processing,
producing weird rolling behaviour and corner overlaps.

Experimented with some new spring settings.
Improved UI: click/drag highlighting, began Scoop

Selected/clicked blob is now highlighted.

Scoop physics written, now to have it display, and instantiate for
testing.