Prevention of action on certain routes for guest user when public access
is enabled. Could not see a way this could be a security issue, beyond a
mild nuisance that'd only be visible if public users can edit, which
would present larger potential nuisance anyway.
- Ensured watch options passed in all meta template usage to fix failing
scenarios where watch options did not exist.
- Fixed testing issue caused by guest user permission caching.
- Added general user preferences view and updated link in profile menu
to suit.
- Made notification permission required for notification preferences
view, added test to cover.
- Adds option filtering and alternative text for page watch options.
- Adds "Watched & Ignored Items" list to user notification preferences
page to show existing watched items.
Ensures some sensible text is always in webhook text data.
Also aligned some notification reporting to use centralised activity
system instead of custom success events.
For #4216
