the old implementation based upon wxHashMap. Removed support for wxHashTable in wxHashMap. Rationale: using wxHashMap for wxHashTable implementation required special support in wxHashMap. This precluded using STL-provided hash_map to implement wxHashMap. This new implementation does not use keyed wxList interface and should be almost totally compatible with the old non-STL wxHashTable. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@24638 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775