port LHCb MT developments to Gaudi master

among others we have

• Gaudi::Functional: base classes to write algorithms as pure functions
• AnyDataWrapper/AnyDataHandle: helper to store any type in the Transient Store (DataSvc)
• fixes to DataObjectHandle
• fixes to GaudiHive
• new tests and examples
• modernization (range loops, removed empty destructors, ...)