This adds a blocklist, which is applied to the crawling of all types.
For artworks, the list with already crawled items is initialized with the complete blocklist,
for all other types, all array-like attributes in the artwork dictionary are cleared from items on the blocklist, therefore they shouldn't be crawled. Closes #513
This adds a blocklist, which is applied to the crawling of all types. For artworks, the list with already crawled items is initialized with the complete blocklist, for all other types, all array-like attributes in the artwork dictionary are cleared from items on the blocklist, therefore they shouldn't be crawled. Closes #513