MAPG-69 merge SignupController to LoginController and introduce Google login/sign up

views/login/cancel.php

@@ -0,0 +1,13 @@
+<?php require ROOT . '/views/templates/main_header.php'; ?>
+<?php require ROOT . '/views/templates/header.php'; ?>
+<div class="main">
+    <h2>Account cancellation</h2>
+    <div class="box">
+        <?php if ($success) : ?>
+            <p class="justify">Cancellation was successfull. You can <a href="/signup" title="Sign up">sign up</a> any time if you want!</p>
+        <?php else: ?>
+            <p class="error justify">Cancellation failed. Please check the link you entered! Maybe the account was already deleted, in this case no further action is required.</p>
+        <?php endif; ?>
+    </div>
+</div>
+<?php require ROOT . '/views/templates/main_footer.php'; ?>