announcement: Decoupling blackboard module from BlackboardSync

[sanjacob]

With the goal of decoupling things and allowing these two projects to grow on their own, I have begun decoupling BlackboardSync from the Blackboard API Client (module blackboard), the latter now exists in its own repo bblearn.

The current goals for BlackboardSync are to improve error prevention, static verification, and to refactor.
Furthermore, also to set the scene for future features such as improved content filtering.