CLuaInstance: Move msg box functions in separate classes / files

- hintbox
 - messagebox

 - No api changes, code only

src/gui/lua/lua_messagebox.h

@@ -0,0 +1,46 @@
+/*
+ * lua messagebox
+ *
+ * (C) 2014 by martii
+ * (C) 2014-2015 M. Liebmann (micha-bbg)
+ * (C) 2014 Sven Hoefer (svenhoefer)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _LUAMESSAGEBOX_H
+#define _LUAMESSAGEBOX_H
+
+class CLuaMessagebox
+{
+	public:
+		CMessageBox *b;
+		CLuaMessagebox();
+		~CLuaMessagebox();
+};
+
+class CLuaInstMessagebox
+{
+	public:
+		CLuaInstMessagebox() {};
+		~CLuaInstMessagebox() {};
+		static CLuaInstMessagebox* getInstance();
+		static void MessageboxRegister(lua_State *L);
+
+	private:
+//		static CLuaMessagebox *MessageboxCheck(lua_State *L, int n);
+		static int MessageboxExec(lua_State *L);
+};
+
+#endif //_LUAMESSAGEBOX_H