split the group edit form into seperate parts for extendability

#4391

I moved the different parts of the group edit form to their own views so it's easier for plugin developers to overrule/extend the different parts.

Use case:
Profile manager wants to overrule the group profile options (including form parts) and group tools wants to edit the group tool options. In the old case both of these plugins would be fighting over the form view.
Now that is split it up into different parts profile manager can just edit the profile part and group tools can take the other part.