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/scriptable.cpp

@@ -78,7 +78,7 @@ void OptionalScript::initDependencies(Context& ctx, const Dependency& dep) const
 }
 
 Script& OptionalScript::getMutableScript() {
-	if (!script) script = new_intrusive<Script>();
+	if (!script) script = intrusive(new Script());
 	return *script;
 }