add setting for edit controls+solution

A new setting *edit controls which is a Pointer with these *options as checkboxes, which if checked do the following:

link in menu - makes "Edit" link available
double-click - makes double-clicking trigger editing
require permissions - show / respond to edit controls only if the user has permission to edit the card

Note that these can be options in a "*edit controls+*right+*options" Pointer without actually adding cards with those names.