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/VCMI_Lib.cpp

@@ -25,7 +25,10 @@
 #include "spells/effects/Registry.h"
 #include "CSkillHandler.h"
 #include "CGeneralTextHandler.h"
-#include "CModHandler.h"
+#include "modding/CModHandler.h"
+#include "modding/CModInfo.h"
+#include "modding/IdentifierStorage.h"
+#include "modding/CModVersion.h"
 #include "IGameEventsReceiver.h"
 #include "CStopWatch.h"
 #include "VCMIDirs.h"
@@ -106,6 +109,11 @@ const IBonusTypeHandler * LibClasses::getBth() const
 	return bth;
 }
 
+const CIdentifierStorage * LibClasses::identifiers() const
+{
+	return &modh->getIdentifiers();
+}
+
 const spells::effects::Registry * LibClasses::spellEffects() const
 {
 	return spells::effects::GlobalRegistry::get();