Set new default weights per node type
Give Articles a default weight of 5, so the extra field is after Body (0) and before Tags (10).
Give Pages a default weight of 101, so the extra field is after Body (100), and the same as Links (101) but seems to display after Links instead of before, unfortunately.
Other node types default to the same weight as Pages.
Add cache contexts to vary caching by URL
Fixes issue where the AddToAny instance (an AddToAny Block, for example) was rendered with static attributes (sharing whichever URL/title was cached first) instead of dynamic attributes (sharing the current node's URL/title).