Add some traits for common Inline implementations

src/Components/Inlines/DefaultBeginPosition.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Erusev\Parsedown\Components\Inlines;
+
+trait DefaultBeginPosition
+{
+    /** @return int|null */
+    public function modifyStartPositionTo()
+    {
+        return null;
+    }
+}

src/Components/Inlines/WidthTrait.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Erusev\Parsedown\Components\Inlines;
+
+trait WidthTrait
+{
+    /** @var int */
+    private $width;
+
+    /** @return int */
+    public function width()
+    {
+        return $this->width;
+    }
+}