constants: Avoid manual requires

We can just use `files` autoloader and have composer require it automatically.

Author: jtojnar

composer.json

@@ -49,7 +49,10 @@
             "spouts\\": "src/spouts/",
             "Selfoss\\": "src/",
             "Tests\\": "tests/"
-        }
+        },
+        "files": [
+            "src/constants.php"
+        ]
     },
     "config": {
         "platform": {

phpstan.dist.neon

@@ -9,7 +9,6 @@ parameters:
         - run.php
 
     bootstrapFiles:
-        - src/constants.php
         - vendor/bin/.phpunit/phpunit/vendor/autoload.php
 
     stubFiles:

src/common.php

@@ -20,8 +20,6 @@
 use Symfony\Component\Cache\Psr16Cache;
 use Tracy\Debugger;
 
-require __DIR__ . '/constants.php';
-
 function boot_error(string $message): never {
     http_response_code(500);
     header('Content-Type: text/plain');

tests/bootstrap.php

@@ -2,7 +2,6 @@
 
 declare(strict_types=1);
 
-require __DIR__ . '/../src/constants.php';
 require __DIR__ . '/../vendor/autoload.php';
 
 date_default_timezone_set('UTC');