Vast improvements to speed slider
Clean up event loop and take care of a few corner cases.
Add model selection to tortoise page. Fix session teardown.
Get turtle, link, and patch buttons to work.
Add minimal error handling when opening models
Add classes to widgets
Store open model in url for easy refresh
Start styling widgets
Style sliders and other widgets
Style monitors
Tweaked slider input
Add container that wrap the entire model.
Cleanup some styling stuff
Graceful fail on buttons that failed to compile
Fix padding issue with monitors
Add plots