Add dev_commit.sh helper and no-emoji mandate

wp-includes/Text/Exception.php

@@ -0,0 +1,11 @@
+<?php
+/**
+ * Exception for errors from the Text_Diff package.
+ *
+ * {@internal This is a WP native addition to the external Text_Diff package.}
+ *
+ * @package WordPress
+ * @subpackage Text_Diff
+ */
+
+class Text_Exception extends Exception {}