Let's abstract early so we don't have to do a bunch of refactoring later
A basic Customizer manager class
Bit more code that doesn't do anything yet
A template tag for getting the posts of a collection
Track which collections are rendered on a page, and report them to the Customizer
Hide our prototype collection by default
Rename to grant us more flexibility
Static cachey goodness
Create a separate item type for Customizer items

We want to reserve `staged` for later use, so let's explicitly create a Customizer item concept
True double-underscore to make it easier to rename
Create a control for each collection from the prototype
Abstract this business out so it's reusable
Hook up Collection Controls in the Customizer
Only reset if they've been changed
Allow names to be normal strings too
Another helpful template tag
Move this thang over so we can use it for collections on the page too
Not using this for the moment
Allow for live preview of Collection Items in the Customizer
Minor retooling