Huge number of updates, too tired to list them all

+ Added a bunch of API handler classes that will use the already created models
+ Created a new Client class that will connect to new API handler classes
+ Created new collection classes

src/Model/StatusState.php

@@ -0,0 +1,24 @@
+<?php declare(strict_types=1);
+namespace Gitea\Models;
+
+use Enum\{EnumTrait};
+
+/** Defines the state of a Gitea status. */
+final class StatusState {
+  use EnumTrait;
+
+  /** @var string The status is an error. */
+  const error = 'error';
+
+  /** @var string The status is a failure. */
+  const failure = 'failure';
+
+  /** @var string The status is pending. */
+  const pending = 'pending';
+
+  /** @var string The status is a success. */
+  const success = 'success';
+
+  /** @var string The status is a warning. */
+  const warning = 'warning';
+}