Entity Repo & Controller Refactor (#1690)

* Started mass-refactoring of the current entity repos

* Rewrote book tree logic

- Now does two simple queries instead of one really complex one.
- Extracted logic into its own class.
- Remove model-level akward union field listing.
- Logic now more readable than being large separate query and
compilation functions.

* Extracted and split book sort logic

* Finished up Book controller/repo organisation

* Refactored bookshelves controllers and repo parts

* Fixed issues found via phpunit

* Refactored Chapter controller

* Updated Chapter export controller

* Started Page controller/repo refactor

* Refactored another chunk of PageController

* Completed initial pagecontroller refactor pass

* Fixed tests and continued reduction of old repos

* Removed old page remove and further reduced entity repo

* Removed old entity repo, split out page controller

* Ran phpcbf and split out some page content methods

* Tidied up some EntityProvider elements

* Fixed issued caused by viewservice change

tests/Uploads/AttachmentTest.php

@@ -223,7 +223,7 @@ class AttachmentTest extends TestCase
     {
         $admin = $this->getAdmin();
         $viewer = $this->getViewer();
-        $page = Page::first();
+        $page = Page::first(); /** @var Page $page */
 
         $this->actingAs($admin);
         $fileName = 'permission_test.txt';
@@ -233,7 +233,7 @@ class AttachmentTest extends TestCase
         $page->restricted = true;
         $page->permissions()->delete();
         $page->save();
-        $this->app[PermissionService::class]->buildJointPermissionsForEntity($page);
+        $page->rebuildPermissions();
         $page->load('jointPermissions');
 
         $this->actingAs($viewer);