In MSVC2012, more bases classes for std::string
and containers were introduced whereas std::pair_base
was removed compared to MSVC2010.

Add a findMember() function to be able to skip base
classes when looking for a certain member to finally
fix this issue.
Introduce SymbolGroupValue::parent()/childCount()
and simplify the helpers using it.

Change-Id: I7a6aad5c07739ca9cbf350489acd6d03bd1865e8
Reviewed-by: hjk <qthjk@ovi.com>