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/util/io/reader.hpp

@@ -200,7 +200,7 @@ class Reader {
  */
 template <typename T>
 intrusive_ptr<T> read_new(Reader& reader) {
-	return new_intrusive<T>();
+	return intrusive(new T());
 }
 
 /// Update the 'index' member of a value for use by IndexMap