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.
Removes page/chpater addSelect global query, to load book slug, and
instead extracts base queries to be managed in new static class, while
updating specific entitiy relation loading to use our more efficient
MixedEntityListLoader where appropriate.
Related to #4823
- Updated to go through HomeController with the builder as a helper
class.
- Extracted some reapeated items into variables in manifest.
- Updated background color to match those used by BookStack.
- Removed reference of icon.ico since its not intended to be used.
- Added tests to cover functionality.
Review of #4430
