Replace DataObjID{,Coll}Property with Gaudi::Property<DataObjID{,Coll}>

Fixes #1 (closed)

• re-order includes so that DataObjID.h is included prior to Property.h
• remove include of Property.h from TypeNameString.h, and add an alternative to the TypeNameString constructor from Gaudi::Property (without mentioning Gaudi::Property) to avoid a very early inclusion of Property.h, which makes it very difficult to add a parse function to the overload set in Gaudi::Parsers prior to its usage in Property.h
• add parse and toStream as friend functions to DataObjID (required for Gaudi::Property<DataObjID>)
• add a grammar for parsing DataObjID which can be used by the parser of DataObjIDColl = std::unordered_set<DataObjID> as 'inner' parser
• add Gaudi::Parsers::parse overload for DataObjIDColl (required for Gaudi::Property<DataObjIDColl>)
• remove dedicated DataObjID{,Coll,Property class, but provide a backwards compatible 'using' alias for them -- and mark their use as deprecated
• add (outer) parsers for std::unordered_{map,set} to GrammarsV2.h
• add toStream for std::unordered_{map,set} to ToStream.h