Deprecate non-standard display of title and other base fields

#2353867: [META] Expose Title and other base fields in Manage Display will introduce the "normal" mechanism for managing display of title and other base fields. In particular #3036862: Expose Title and other base fields in Manage Display in Drupal Core will create a GUI option to enable the normal mechanism.

This purpose of this issue is to deprecate the old specialist non-standard way. At the point of writing, we haven't even invented the new way yet so this issue is planning ahead and guessing somewhat. However it's likely that it would involve

1. Warning in the status page if the GUI option is still set to the old specialist non-standard way.
2. Deprecate all the specific items that will be removed in #3015623: Remove outdated code relating to "Expose Title in Manage Display"

We can use the Twig deprecated tag to deprecate templates.