Use registration forms like post forms

[svenl77]

Is your feature request related to a problem? Please describe.
At the moment we only have edit and manage submission endpoints. The user can see his submissions and create new. We should use this also for reg forms and allow the user to see the form to edit his profile

Describe the solution you'd like
Change the buttons form "Your submissions" and "The Form" to one "User Meta Form" or something like this

It would also enable us to allow to integrate reg forms with BuddyPress or Ultimate Member.

But we do not need the tab logic "View / Add". If the form is of type reg form the tab logic needs to be changed to view and edit

the view should display the submission. It should not be possible to create a new submission. Only update the existing.

Screenshots