More refactoring toward MVC
Refactored controls for auto-regeneration
Patched zooming / recentering
Added TODO and BUG lists
Added first pass at color segmenting
Updated TODO
Replaced imageData with fillRect

and removed incorrect color segmentation
Updated TODO since we're not rendering the same way
Added panning

MandelCanvas handles redrawing and event listening.  Other drawing and
controls are offline.
Reactivated most controls

gave web controls access to global MandelCanvas state variable.