Formatting
Imporved keyframe editor frame handling.

The zoom function needs to be set so that the entire animation (based on the frame limit) can be seen when the frame
limit is adjusted. This will let us have better control over 40 frame animations versus 200 frame animations...
Bufgix
Add insert key menu option
Change nomenclature to better reflect class variables and increase code readability.
Abstract out delete key logic and add cut/copy
Add paste option, but no logic.