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.
Tools seems to fit better since the classes were a bit of a mixed bunch
and did not always manage.
Also simplified the structure of the SlugGenerator class.
Also focused EntityContext on shelves and simplified to use session
helper.
Renamed some columns to be more generic and applicable.
Removed now redundant book_id column.
Allowed nullable entity morph columns for non-entity activity.
Ran tests and made required changes.
