Pulling PersistentObjectCache out of DbSqlSession, bringing it to the same level (a Session implementation).
Next stop is making the EntityManagers engine static (now they are session instantiated) and extracting an interface for the DbSqlSession.

- Support for subclasses (eg Timer/Message > Job)  when doing a getList on the cache

Format back to 2 spaces for now, merging back from Activiti 5 is really an issue with spacing differences

- Introduced AbstractEntityManager as parent class for all EntityManager classes (and removed methods from AbstractManager)
- Introduced new getList method on AbstractEntityManager, that replaces data from the db with data in the cache (which can be more up to date) for correcter results