Revert "client support for 'anchor' element"

This reverts commit bfa8db5a232fc088d486dbafec3eacb25765968b.

Conflicts:

	extensions/familysearch/familysearch-api-model/src/main/java/org/familysearch/platform/rt/FamilySearchPlatformAnchorFinder.java
	extensions/familysearch/familysearch-api-model/src/main/java/org/familysearch/platform/users/User.java
	gedcomx-rs-client/src/main/java/org/gedcomx/rs/client/PlaceState.java
Revert "adding the 'anchor' attribute to the elements of a gx document"

This reverts commit 8b0765a0b600e6defb753eca7db8042c7c1e41c2.
renaming the 'scope' to a more descriptive 'main data element' and re-ordering the link loading priority