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.
Also moved to a non-static approach, and added a high-level class to
allow easy access to all other entity queries, for use in mixed-entity
scenarios and easier/simpler injection.
For book, shelves and chapters.
Made much of the existing handling generic to entity types.
Added new MixedEntityListLoader to help load lists somewhat efficiently.
Only manually tested so far.
Rolled out HTML editor field and store logic across all target entity
types. Cleaned up WYSIWYG input logic and design.
Cleaned up some injected classes while there.
