missing_method node lookup cache
move new's default settings to a class variable
whitespace
Revert "rewrite `self.load_fxml_resource` to be more Ruby and less brittle"

This reverts commit 6e2dcba9cf8170e163a31f4ba396e631f59e4b41.
Restore `self.load_fxml_resource`'s special caller[relative_to] behavior