Split massive CModHandler class/file into multiple parts:

- IdentifierStorage is now a separate handler in VLC
- Renamed ModHandler::Incompatibility exception to ModIncompatibility
- Extracted ModScope namespace from ModHandler
- Extracted ModUtilities namespace from ModHandler
- Split CModHandler.cpp on per-class basis
- Replaced some direct members with unique_ptr to reduce header includes

lib/modding/ModUtility.h

@@ -0,0 +1,25 @@
+/*
+ * ModUtility.h, part of VCMI engine
+ *
+ * Authors: listed in file AUTHORS in main folder
+ *
+ * License: GNU General Public License v2.0 or later
+ * Full text of license available in license.txt file, in main folder
+ *
+ */
+#pragma once
+
+VCMI_LIB_NAMESPACE_BEGIN
+
+// NOTE: all methods in this namespace should be considered internal to modding system and should not be used outside of this module
+namespace ModUtility
+{
+	DLL_LINKAGE std::string normalizeIdentifier(const std::string & scope, const std::string & remoteScope, const std::string & identifier);
+
+	DLL_LINKAGE void parseIdentifier(const std::string & fullIdentifier, std::string & scope, std::string & type, std::string & identifier);
+
+	DLL_LINKAGE std::string makeFullIdentifier(const std::string & scope, const std::string & type, const std::string & identifier);
+
+};
+
+VCMI_LIB_NAMESPACE_END