Creation of storage mechanism for operational info

In Event Broker v2.x, operations and plugins could store operational information and other "hidden parameters" (such as timestamps) for later use.

As Event Broker v3.0 has no database, a new storage mechanism for this kind of information is required. It should be similiar to Identity Broker's "Stored Values Engine", except using something similiar to XML files in isolated storage rather than a database. It requires, at a minimum:

• The ability to share information amongst operations in an operation list by the loading & saving of values.
• Values to be stored and retrieved in a similar fashion to IValue in the entity value collection (strongly typed).

Other potential uses include:

• A persistent store for operational information such as the execution times of operation lists, etc.