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

resources/views/form/entity-permissions.blade.php

@@ -19,7 +19,7 @@
                 <a href="#" permissions-table-toggle-all class="text-small ml-m text-primary">{{ trans('common.toggle_all') }}</a>
             </th>
         </tr>
-        @foreach($roles as $role)
+        @foreach(\BookStack\Auth\Role::restrictable() as $role)
             <tr>
                 <td width="33%" class="pt-m">
                     {{ $role->display_name }}