Add property-defined actions and populate FN if unchanged or empty

[skjnldsv]

Fix #821

Action	Auto-fill

[jancborchardt]

Nice! Some details:

• The "Detailed name" header is duplicated? The second one (which is also misaligned) seems not necessary? Then the 3-dot menu can just be on the row of the heading.
• The "Delete" action should always be the very last in a menu.
• When you initially use the detailed name to fill, it auto-fills the main name field (second gif). Couldn’t that also happen on change? The "Copy to full name" action seems like unnecessary work for users?

[skjnldsv]

Hey thanks :)

1. let's see that in another issue then. I could indeed need some help on this. This design have been like that for ages 🙈
2. 👍
3. Well, this was a feature that was requested to be removed a lot on the previous versions. Basically in the vcard you can set the display Name and the detailed name. Those can and need to be completely independant. I can rename my wife Wife 🥰 but still wants to keep the detailed name informations.
   This is why we have an automated step (that use the detailed name to fill the display name in some cases only:
   1. the displayName is not set
   2. the displayName is empty
   3. the displayName is still set to the default New Contact
      BUT if you manually want to have the same you can use the copy action. (or not use a detailed name property at all, this is allowed)

[jancborchardt]

Looking good then!