Remove all pieces of original Land Manager permissions system

[mradamcox]

Once the new LandManager profile system has been fully implemented, a lot of content can be removed from the codebase.

code removal

• get_rules(), get_state_node_match(), and quick_query()methods in SiteFilter (and perhaps more)
• user_can_access_resource_instance decorator
• UserXResourceInstanceAccess hms model
• user_is_old_landmanager() in permission_backend
• hms/utils.py (entire file will be unnecessary)
  Region fpan model Originally thought this could be removed, but keeping it for the ScoutProfile.region_choices relationship is better for now.
  ManagedArea fpan model thought this could be removed, but it's needed by many migrations. Will need a serious refactor to fully remove.
• fpan/admin.py registration
  fpan/models.py can't remove this until its models are fully deprecated
• permissions defintions in settings.py
• any old permissions-related code in fpan-data
• scout_assignemt function which attempts to update the UserXResourceInstanceAccess table

data removal

• All tiles from the "Located in..." branch of each resource model
• The "Located in..." branch itself from each resource model
• Managed Area concepts/collections in the RDM
• Managed Area Categories concepts/collections in the RDM
• Managing Agency concepts/collections in the RDM
• save all above changes back to the fpan-data package