To centralise logic to be more consistent, and to have smarter logic
which avoids just following newline format from input, preventing
smushing HTML elements (like list elements) next to eachother
- Merged book and chapter name items to a single page path list item
which has links to parent page/chapter.
- Added permission filtering to page path elements.
- Added page path to also be on comment notifications.
- Updated testing to cover.
- Added new Message Line objects to support.
Done during review of #4629
- This ensures content notifications are not translated to receiver
language.
- This adds actual plaintext support for content notifications (Was
previously just HTML as text view).
- Shares same base class across all mail notifications.
- Also cleaned up existing notification classes.
Future cleanup requested via #4501
- Updated mail notification design to be a bit prettier, and extracted
text to new lang file for translation.
- Added debounce logic for page update notifications.
- Fixed watch options not being filtered to current user.
