merge signup and google signup handling with username support

views/login/signup.php

@@ -8,7 +8,7 @@
     <div class="box">
         <form id="signupForm" action="/signup" method="post" data-redirect-on-success="/signup/success">
             <?php if (isset($email)): ?>
-                <p class="justify">No user found with the given email address. Sign up with one click!</p>
+                <p class="justify">No user found with the given email address / username. Sign up with one click!</p>
                 <input type="email" class="text big fullWidth marginTop" name="email" placeholder="Email address" autocomplete="username" value="<?= $email ?>" required>
                 <input type="password" class="text big fullWidth marginTop" name="password" placeholder="Password confirmation" autocomplete="new-password" required minlength="6" autofocus>
             <?php else: ?>
@@ -16,6 +16,7 @@
                 <input type="password" class="text big fullWidth marginTop" name="password" placeholder="Password" autocomplete="new-password" required minlength="6">
                 <input type="password" class="text big fullWidth marginTop" name="password_confirm" placeholder="Password confirmation" autocomplete="new-password" minlength="6">
             <?php endif; ?>
+            <input type="username" class="text big fullWidth marginTop" name="username" placeholder="Username">
             <?php if (!empty($_ENV['RECAPTCHA_SITEKEY'])): ?>
                 <div class="marginTop">
                     <div class="g-recaptcha" data-sitekey="<?= $_ENV['RECAPTCHA_SITEKEY'] ?>"></div>