This is a major rewrite of the system of Property classes. Started as the implementation of GAUDI-1214, it continued as a review of IProperty and PropertyMgr, to end up in a complete rewrite (and optimization) of PropertyWithValue.
Fixes GAUDI-1214
added missing declareProperty signature
added PropertyHolder (an updated PropertyMgr)
adapted all properties in Gaudi
improved use of PropertyHolder
use inheritance instead of composition
removed ~200 (duplicated) lines of code in GaudiKernel
optimization of Property (fixes GAUDI-1229)
use templates and automatic code generation to handle efficiently both value and reference properties
avoid creation of values on the heap (see GAUDI-1229)
removed the owned boolean flag
improved usability of properties (e.g. begin/end wrappers for C++11 loops, increment/decrement operators...)
deprecated use of C arrays as properties
merged features of PropertyWithVerifier, SimpleProperty and SimplePropertyRef into PropertyWithValue
deduplication of name and doc strings via boost::string_ref and a static storage (see GAUDI-1229)
Fixes GAUDI-1205
added deprecation warnings in service accessors of Algorithm (@graven)
renamed Property base class to Gaudi::Details::PropertyBase and PropertyWithValue to Gaudi::Property
added backward compatibility type aliases (but not compatible with forward declarations of class Property, which should be replaced by #include "GaudiKernel/PropertyFwd.h")
added macro GAUDI_PROPERTY_v2 to allow easy implementation of backward compatible changes in derived projects (e.g. when user code relied on DoubleProperty having a verifier)
Fixes GAUDI-1268
The changes are as backward compatible as much as possible (except if you explicitly inherit from SimpleProperty, or you forward declared class Property, which now are typedefs), but must be validated in the experiment frameworks.
