Reviewed adding IP recording to activity & audit log

Review of #2936

- Added testing to cover
- Added APP_PROXIES to .env.example.complete with details.
- Renamed migration to better align the name and to set the migration
  date to fit with production deploy order.
- Removed index from IP column in migration since an index does not yet
  provide any value.
- Updated table header text label.
- Prevented IP recording when in demo mode.

resources/views/settings/audit.blade.php

@@ -62,7 +62,7 @@
                     <a href="{{ sortUrl('/settings/audit', $listDetails, ['sort' => 'key']) }}">{{ trans('settings.audit_table_event') }}</a>
                 </th>
                 <th>{{ trans('settings.audit_table_related') }}</th>
-                <th>{{ trans('settings.audit_table_user_ip') }}</th>
+                <th>{{ trans('settings.audit_table_ip') }}</th>
                 <th>
                     <a href="{{ sortUrl('/settings/audit', $listDetails, ['sort' => 'created_at']) }}">{{ trans('settings.audit_table_date') }}</a></th>
             </tr>