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/CommandsTest.php

@@ -2,7 +2,6 @@
 
 use BookStack\Auth\Permissions\JointPermission;
 use BookStack\Entities\Page;
-use BookStack\Entities\Repos\EntityRepo;
 use BookStack\Auth\User;
 use BookStack\Entities\Repos\PageRepo;
 
@@ -56,7 +55,7 @@ class CommandsTest extends TestCase
         $this->asEditor();
         $pageRepo = app(PageRepo::class);
         $page = Page::first();
-        $pageRepo->updatePage($page, $page->book_id, ['name' => 'updated page', 'html' => '<p>new content</p>', 'summary' => 'page revision testing']);
+        $pageRepo->update($page, ['name' => 'updated page', 'html' => '<p>new content</p>', 'summary' => 'page revision testing']);
         $pageRepo->updatePageDraft($page, ['name' => 'updated page', 'html' => '<p>new content in draft</p>', 'summary' => 'page revision testing']);
 
         $this->assertDatabaseHas('page_revisions', [