Hook up UI interactions for new scale-up UI

Hooked up tests for the UI interactions of the scale-up view

Simplified scale-up view interaction code to apply classes instead of manage state
Merge pull request #425 from hatched/hook-up-scaleup

Hooked up UI interactions for new inspector scale-up view

The new inspector scale up UI interactions are now functional. The follow-up will hook the UI to the back-end.