Instead of the new_intrusive<T>() functions, use intrusive(new T)

This means we no longer need 8 different functions for different numbers of arguments, and non-const references can now also be passed to constructors without problems.

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@1443 0fc631ac-6414-0410-93d0-97cfa31319b6

src/script/image.cpp

@@ -80,7 +80,7 @@ template <> void Reader::handle(ScriptableImage& s) {
 		s.script.parse(*this, true);
 	} else {
 		// a filename
-		s.value = new_intrusive1<PackagedImage>(s.script.unparsed);
+		s.value = intrusive(new PackagedImage(s.script.unparsed));
 	}
 }
 template <> void Writer::handle(const ScriptableImage& s) {