Age Link info names => plString
Animation SDL variable names => plString
Fix winmain use and a couple of remaining SafeStrings => plString
Clean up some crazy in plClientResMgr
Convert ReadSafe(W)String* to the plString variants, and remove the now
unneeded _TEMP variants.  All safe strings read from hsStreams are
now plStringified :)
plString Hash for unordered containers
Convert plClientResMgr to plString

DIE std::string DIE!!!
Plate resource plString
Minor changes to hash and hash_i to avoid making a copy of the string data