Some loading hooks from the tk-premiere framework use methods that require the code Published File field to be in the Published File data.

Added it to the list of required Published File fields

Most of the time, Published Files have no thumbnails.
Add a setting so that the UI can fall back on choosing the linked Version's thumbnail if the Published File has no thumbnail.

• Add a published_file_fields (same as tk-multi-breakdown2) to be able to dynamically add fields to the data returned when querying for Published File in the history
• Add a publish_history_group_by_fields to allow more control of what fields need to match the current Published File to be part of its history. By default, it's still the same value as before, ["project", "task", "entity", "name", "published_file_type"].

Allow to load Published Files based on the Delivery they belong to