Update classroom and gameplay Ux to surface practice levels as 3a, 3b,
etc.
Update next level logic to leverage practice levels based on per level
completion playtime thresholds.
Patrol buster and patrol buster A are live for testing.
Fix a few classroom Ux progress hover bubble info bugs.
Closes#3767
* Do not cache campaign
* Instead have an on leave message if there are unsaved changes
* Propagate campaignIndex values to campaign and levels so that they signal a change in order
The save modal seems to have a lot of issues with identifying what models have
changed. I tried using different methods, but none were consistent. Moving on
to other bugs.
