scbLoad

The scbLoad4 class ensures that only one version of the classes are loaded. Also, it attempts to load the most recent version available.

Here's a general overview of how it works:

1. Hook into 'plugins_loaded' and wait for all possible candidates* to load.
2. Choose the candidate with the most recent version.
3. Fire plugin activation hooks, if necessary. ← this is the trickiest part

* A candidate is a folder containing the scbFramework classes.