Reshape fin-* events

[Dwaynekj]

This branch

Remaining work

• [ ] Provide backwards compatibility by preserving addEventListener and recommending addEventListenerV2
• [ ] Provide two copies of canvas.js one of which emits the old deprecated fin-canvas events
• [ ] Provide two copies of events.js one of which dispatches the old public shape but reshapes the internal event handlers on the feature chain to use the new shape

Summary of whats done thus far.

• Got rid of all fin-canvas* events …
• Internal and external event handlers now utilize the same event shape
• Fixed issues with mouse events dragged off canvas
• The new event shape available is

e.detail
    primitive - Original Canvas Event
    detail may be a Cell Event
    if the event was mouse or keyboard related
    mouse and keys are available.

Alternatively

e.detail
  primitiveEvent
  cellEvent
  mouse 
  keys