First step for implementing Clone
Step 1: Added interface and concret class for implementing EntityTransferrer
Refactored BBBMeetingService
Adapted tool name
Unified bbb-meeting and sakai-bbb to bbb-tool
Unified tool name to bbb-tool
Implemented clone based on BBBMeetingEntityProducer
Implemented cleanup on transferCopyEntities
BBB-103: Cleaned up code before final test
Fix to support "Duplicate Site" function in Sakai 2.9.2