Restructure things so that the application is now just another module.

Kohana makes this type of transition fairly straightforward in that
all controllers/helpers/etc are still located in the cascading
filesystem without any extra effort, except that I've temporarily
added a hack to force modules/gallery into the module path.

Rename what's left of "core" to be "application" so that it conforms
more closely to the Kohana standard (basically, just
application/config/config.php which is the minimal thing that you need
in the application directory)

There's still considerable work left to be done here.

modules/gallery/views/admin_modules.html.php

@@ -0,0 +1,32 @@
+<?php defined("SYSPATH") or die("No direct script access.") ?>
+<div id="gModules">
+  <h1> <?= t("Gallery Modules") ?> </h1>
+  <p>
+    <?= t("Power up your Gallery by adding more modules! Each module provides new cool features.") ?>
+  </p>
+
+  <form method="post" action="<?= url::site("admin/modules/save") ?>">
+    <?= access::csrf_form_field() ?>
+    <table>
+      <tr>
+        <th> <?= t("Installed") ?> </th>
+        <th> <?= t("Name") ?> </th>
+        <th> <?= t("Version") ?> </th>
+        <th> <?= t("Description") ?> </th>
+      </tr>
+      <? $i = 0 ?>
+      <? foreach ($available as $module_name => $module_info):  ?>
+      <tr class="<?= ($i % 2 == 0) ? "gEvenRow" : "gOddRow" ?>">
+        <? $data = array("name" => $module_name); ?>
+        <? if ($module_info->locked) $data["disabled"] = 1; ?>
+        <td> <?= form::checkbox($data, '1', module::is_active($module_name)) ?> </td>
+        <td> <?= t($module_info->name) ?> </td>
+        <td> <?= $module_info->version ?> </td>
+        <td> <?= t($module_info->description) ?> </td>
+      </tr>
+      <? $i++ ?>
+      <? endforeach ?>
+    </table>
+    <input type="submit" value="<?= t("Update") ?>"/>
+  </form>
+</div>