Revert "fixed and tested templatization of ValueDescription<std::map<K,V>>"

This reverts commit 9981788e7ebe0192d3114c7bdf01fab7b8872faf.
Revert "enabled templating of stringToKey and keyToString conversion functions"

This reverts commit 01f2df097a21b6411334171867e7cfc97c46d6fd.