Display Q<>Pointers/Work towards displaying maps/QMaps in CDB.
Make dumpers pass on more size information initially, namely the various Q<>Pointers. Introduce enum for those special template types whose size does not vary with the arguments (Q<>Pointer, std::allocators...) to make it more easily extensible. Pass on some common QMapNode<> sizes as well. Introduce an expression cache to the common QtDumperHelper class and make dumpers pass some common expression values (value offsets of common QMapNode<> incarnations). Make CDBDumperHelper use the expression cache. Extend dumper tester.
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