Refactored all entity classes: added an interface for each entity, such that alternative data stores can swap out the entity objects with more fitting ones (eg with annotations like Neo4j, JPA, etc or other mechanisms. Internally, only the entity interface is used)

Refactoring EventSubscriptionEntityManagerImpl: use the getList that goes to the cache instead of use a local list (needed to make entityManager classes engine scoped, instead of command scoped.

(work in progress) Moving logic from entities into EntityManager classes. Removing unneeded methods and consolidating almost similar logic.

Changes for multiple VariableInstance insertions in one query

Remove an extra statement

Added bulk insert for UserEntity

Changes in all entities for bulk insert

Added Oracle specific bulk insert queries

Resolve Test Issues

ACT-4014 Changes for maintaining dependency ordering for entities while inserting

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

ACT-1136 Add support for intermediate catching message event

ACT-1091 ACT-1092 ACT-1093 ACT-1094 ACT-1095 Adding persistent event subscriptions providing  support for signal events, event based gateway, compensation and transaction