event_sequencer - Add basic sizing of state viewer based on data
event_sequencer - Add basic sizing of state viewer based on data

Intent here is to scale the size of the circle that is used to display the state based on the amount of items in that state.

Establishes new concepts of:
- TransitionSet.getNetDeltas() - summary of deltas by state in that transition
- EventSequence.getAmountSequenceForState() - running totals for a given state
- Dependency injection of the SequenceViewer into the StateViewer so the StateViewers can probe for things like currentTransition being shown or the max state population.

brianhonohan/sketchbook,brianhonohan/sketchbook,brianhonohan/sketchbook