Removing step which extracts xMin and xMax from animation

[#52818341] These values should be supplied by the semantic JSON.

https://www.pivotaltracker.com/story/show/52818341
Use AnimationPane xMin and xMax from semantic JSON

This finishes the generator work for [#52818341] - creation of the AnimationPane now expects to find xMin and xMax values in its hash, and hands those on to the runtime JSON instead of calculating them.

https://www.pivotaltracker.com/story/show/52818341
Built JS files for AnimationPane xMin and xMax

This is just the compiled JS from the changes in 745bb285ee0048413ae39eedda57eee7309ab401 and 906d52dfcebd298b96d9d957f2ebe3c3124cc212 .