Bunch of changes including mpdf library for creating pdf of invoices. It now attaches a PDF invoice when marked sent. Don't mark invoice_status sent if it partial or paid, removed green text from balance under clients only use red if the client has a balance and some other cleanups were done

vendor/myclabs/deep-copy/fixtures/f004/UnclonableItem.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace DeepCopy\f004;
+
+use BadMethodCallException;
+
+class UnclonableItem
+{
+    private function __clone()
+    {
+        throw new BadMethodCallException('Unsupported call.');
+    }
+}