Some preset fields like the access-restriction field manage
multiple tags at once (access=*, foot=*, bicycle=*, …). Then
iD wasn't able to show inline help when clicking the ⓘ button.
This introduces a new parameter for these kind of fields:
`referenceKey` determines the tag key which should be used to
search taginfo documentation for.
Fixes#2222.
The [values](http://taginfo.openstreetmap.org/keys/addr%3Ahousename#values) of this rarely needed tag, which is prominent in the address presets, now have a lot of numbers and descriptive words in many different languages. Removing the preset means that new editors won’t fill this key with information useless to the key but can still add it through All tags if needed. A similar thing happened when Potlatch put the designation tag into presets. Goes towards #1427 and #2124.
