Mark most classes final

Composition over inheritance as a best practice we should strive to follow:
https://en.wikipedia.org/wiki/Composition_over_inheritance

It should be fine to do this for controllers and daos since those are entirely internal. There is a slight chance that someone is extending one of the helpers in their spouts but I have not seen that on GitHub so I consider disallowing that acceptable.

We will still keep the following non-final:
- `daos\mysql\{Items,Sources,Statements,Tags}` because we were too lazy to follow the best practice there.
- `helpers\WebClient` because we mock it in tests.
- `spouts\spout` and its children because it would be too much of a BC break.

Let’s use search and replace and manually skip those that we do not want to finalize.

Author: jtojnar

NEWS.md

@@ -11,7 +11,7 @@
 /**
  * Controller for instance information API
  */
-class About {
+final class About {
     public function __construct(
         private Authentication $authentication,
         private Configuration $configuration,

src/controllers/About.php

@@ -10,7 +10,7 @@
 /**
  * Controller for user related tasks
  */
-class Authentication {
+final class Authentication {
     public function __construct(
         private AuthenticationService $authenticationService,
         private View $view

src/controllers/Authentication.php

@@ -18,7 +18,7 @@
  * @license    GPLv3 (https://www.gnu.org/licenses/gpl-3.0.html)
  * @author     Tobias Zeising <tobias.zeising@aditu.de>
  */
-class Index {
+final class Index {
     public function __construct(
         private Authentication $authentication,
         private \daos\Items $itemsDao,

src/controllers/Index.php

@@ -19,7 +19,7 @@
  * @license    GPLv3 (https://www.gnu.org/licenses/gpl-3.0.html)
  * @author     Tobias Zeising <tobias.zeising@aditu.de>
  */
-class Items {
+final class Items {
     public function __construct(
         private Authentication $authentication,
         private \daos\Items $itemsDao,

src/controllers/Items.php

@@ -10,7 +10,7 @@
 /**
  * Controller for viewing item statistics
  */
-class Stats {
+final class Stats {
     public function __construct(
         private Authentication $authentication,
         private \daos\Items $itemsDao,

src/controllers/Items/Stats.php

@@ -13,7 +13,7 @@
 /**
  * Controller for synchronizing item statuses
  */
-class Sync {
+final class Sync {
     public function __construct(
         private Authentication $authentication,
         private Configuration $configuration,

src/controllers/Items/Sync.php

@@ -18,7 +18,7 @@
  * @author     Michael Moore <stuporglue@gmail.com>
  * @author     Sean Rand <asanernd@gmail.com>
  */
-class Export {
+final class Export {
     public function __construct(
         private Authentication $authentication,
         private Configuration $configuration,

src/controllers/Opml/Export.php

@@ -17,7 +17,7 @@
  * @author     Michael Moore <stuporglue@gmail.com>
  * @author     Sean Rand <asanernd@gmail.com>
  */
-class Import {
+final class Import {
     /** @var array<string, array{id: int, tags: string[]}> Sources that have been imported from the OPML file */
     private array $imported = [];
 

src/controllers/Opml/Import.php

@@ -17,7 +17,7 @@
  * @license    GPLv3 (https://www.gnu.org/licenses/gpl-3.0.html)
  * @author     Tobias Zeising <tobias.zeising@aditu.de>
  */
-class Rss {
+final class Rss {
     public function __construct(
         private Authentication $authentication,
         private Configuration $configuration,