refactor: rewrite all classes to php 7.4 and apply new lint styles

BREAKING CHANGE: Support only PHP 7.4+, Rename almost all classes, Fix
some bugs

src/Entities/IEntity.php

@@ -0,0 +1,7 @@
+<?php declare(strict_types = 1);
+
+namespace WPSteak\Entities;
+
+interface IEntity {
+
+}

src/Entities/IPost.php

@@ -0,0 +1,9 @@
+<?php declare(strict_types = 1);
+
+namespace WPSteak\Entities;
+
+interface IPost extends IEntity {
+
+	public function get_post(): \WP_Post;
+
+}

src/Entities/ITerm.php

@@ -0,0 +1,9 @@
+<?php declare(strict_types = 1);
+
+namespace WPSteak\Entities;
+
+interface ITerm extends IEntity {
+
+	public function get_term(): \WP_Term;
+
+}

src/Entities/Post.php

@@ -0,0 +1,19 @@
+<?php declare(strict_types = 1);
+
+namespace WPSteak\Entities;
+
+abstract class Post implements IPost {
+
+	public const POST_TYPE = 'post';
+
+	protected \WP_Post $post;
+
+	public function __construct( \WP_Post $post ) {
+		$this->post = $post;
+	}
+
+	public function get_post(): \WP_Post {
+		return $this->post;
+	}
+
+}

src/Entities/Term.php

@@ -0,0 +1,19 @@
+<?php declare(strict_types = 1);
+
+namespace WPSteak\Entities;
+
+abstract class Term implements ITerm {
+
+	public const TAXONOMY = 'category';
+
+	protected \WP_Term $term;
+
+	public function __construct( \WP_Term $term ) {
+		$this->term = $term;
+	}
+
+	public function get_term(): \WP_Term {
+		return $this->term;
+	}
+
+}