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/ContentTypeHandler.h

@@ -0,0 +1,77 @@
+/*
+ * ContentTypeHandler.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
+
+#include "../JsonNode.h"
+
+VCMI_LIB_NAMESPACE_BEGIN
+
+class IHandlerBase;
+class CModInfo;
+
+/// internal type to handle loading of one data type (e.g. artifacts, creatures)
+class DLL_LINKAGE ContentTypeHandler
+{
+public:
+	struct ModInfo
+	{
+		/// mod data from this mod and for this mod
+		JsonNode modData;
+		/// mod data for this mod from other mods (patches)
+		JsonNode patches;
+	};
+	/// handler to which all data will be loaded
+	IHandlerBase * handler;
+	std::string objectName;
+
+	/// contains all loaded H3 data
+	std::vector<JsonNode> originalData;
+	std::map<std::string, ModInfo> modData;
+
+	ContentTypeHandler(IHandlerBase * handler, const std::string & objectName);
+
+	/// local version of methods in ContentHandler
+	/// returns true if loading was successful
+	bool preloadModData(const std::string & modName, const std::vector<std::string> & fileList, bool validate);
+	bool loadMod(const std::string & modName, bool validate);
+	void loadCustom();
+	void afterLoadFinalization();
+};
+
+/// class used to load all game data into handlers. Used only during loading
+class DLL_LINKAGE CContentHandler
+{
+	/// preloads all data from fileList as data from modName.
+	bool preloadModData(const std::string & modName, JsonNode modConfig, bool validate);
+
+	/// actually loads data in mod
+	bool loadMod(const std::string & modName, bool validate);
+
+	std::map<std::string, ContentTypeHandler> handlers;
+
+public:
+	void init();
+
+	/// preloads all data from fileList as data from modName.
+	void preloadData(CModInfo & mod);
+
+	/// actually loads data in mod
+	void load(CModInfo & mod);
+
+	void loadCustom();
+
+	/// all data was loaded, time for final validation / integration
+	void afterLoadFinalization();
+
+	const ContentTypeHandler & operator[] (const std::string & name) const;
+};
+
+
+VCMI_LIB_NAMESPACE_END