* adds configurable label-input ratio setting for forms and specializes for RemoveModalForm
* enhances form body html structure for better UX and usage of label-input ratio
* adds admin column on team index view
* refactors Team model, so multiple members can become admins
* adds team migration for switch from fkey->m2m structure
* renames 'Group' to 'Permission' on user index view to avoid confusion between 'Groups' and Teams
* adds new autocomplete route for team-admin selection based on already selected members of the TeamForm
