Reogranize callback-related classes on 1 file = 1 class basis

lib/callback/CDynLibHandler.h

@@ -0,0 +1,34 @@
+/*
+ * CDynLibHandler.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
+
+class CGlobalAI;
+class CBattleGameInterface;
+
+#if SCRIPTING_ENABLED
+namespace scripting
+{
+	class Module;
+}
+#endif
+
+class DLL_LINKAGE CDynLibHandler
+{
+public:
+	static std::shared_ptr<CGlobalAI> getNewAI(const std::string & dllname);
+	static std::shared_ptr<CBattleGameInterface> getNewBattleAI(const std::string & dllname);
+#if SCRIPTING_ENABLED
+	static std::shared_ptr<scripting::Module> getNewScriptingModule(const boost::filesystem::path & dllname);
+#endif
+};
+
+VCMI_LIB_NAMESPACE_END