Add dropzone js uploader as a replacement for uploadify. The latter still remains almost entirely intact.

modules/gallery/views/form_dropzone_buttons.html.php

@@ -0,0 +1,11 @@
+<?php defined("SYSPATH") or die("No direct script access.") ?>
+<div>
+  <!-- Proxy the done request back to our form, since its been ajaxified -->
+  <button id="g-upload-done" class="ui-state-default ui-corner-all" onclick="$('#gAddPhotosForm').submit();return false;">
+  <?= t("Done") ?>
+  </button>
+  <button id="g-upload-cancel-all" class="ui-state-default ui-corner-all">
+  <?= t("Cancel uploads") ?>
+  </button>
+  <span id="g-add-photos-status-message" />
+</div>