Updated setting display to show mulitple number inputs under one heading
group.
Updated settings to use general number field form view template.
Updated translations to match display changes, and to advise on counts.
Added page count control for search results.
Added setting service method, to get settings as integers, with
min/max/default control.
Updating sorting group to be names "Lists & Sorting".
Added tests to cover.
- Updated name to align, and differentate from new 'XQueries' clases.
- Removed old sketchy base class with app resolving workarounds, to a
proper injection-based approach.
- Also fixed wrong translation text used in PageQueries.
- Adapted existing page picker to be usable elsewhere.
- Added endpoint for getting templates for entity picker.
- Added search template filter to support above.
- Updated book save handling to check/validate submitted template.
- Allows non-visible pages to flow through the save process, if not
being changed.
- Updated page deletes to handle removal of default usage on books.
- Tweaked wording and form styles to suit.
- Updated migration to explicity reflect default value.
Primarily intended to show parent book for chapters when moving/copying
pages, since the default parent selector interfaces, which used the
entity-selector search endpoint, would run this popular query when no
term was present as a default backup.
For #4264
