Added ability to use Show-level ratings at the season and episode level for Overlays if the original source does not provide ratings at the season or episode level. This is accomplished using (Special Text Variables)[https://kometa.wiki/en/latest/files/overlays/#special-text-variables] but is not yet available for the `Ratings` Defaults file.
When using `mass_poster_update`, added `ignore_locked` and `ignore_overlays` attributes which will prevent Kometa from resetting the image if the poster field is locked (i.e. a previous mass poster update) or if the item has an Overlay. This can effectively act as a differential update system.
When using `mass_background_update`, added `ignore_locked` attribute which will prevent Kometa from resetting the image if the poster field is locked (i.e. a previous mass poster update). This can effectively act as a differential update system.