New: Allow Re-Editing of Sessions during Session Setup

[micahp2]

When creating a session, either from scratch or via a template, the flow of how the steps should be presented to the user goes like this:

Create + button --> Template selection screen <--> Edit Circle screen <-->Summary screen

This will allow the person editing to go back and forth, as needed, between the screens in order to complete their edits, review how the public will see it, and return all the way back to the templates, if they so choose.