add "json for modern c++" json.hpp file and implement it; it is in a higher level dir so we can add it elsewhere if need be; up next we want to add an option to have an endpoint GET requested on character creation with the suid and character name

engine/server/application/LoginServer/src/shared/ConfigLoginServer.cpp

@@ -115,6 +115,7 @@ void ConfigLoginServer::install(void)
 	KEY_INT (csToolPort, 10666);
 	KEY_BOOL(requireSecureLoginForCsTool, true);
 	KEY_BOOL(useExternalAuth, false);
+	KEY_STRING(externalAuthURL, "");
 
 	int index = 0;
 	char const * result = 0;