refactor(auth): change contributor's role logic to have it included in the users_podcasts table

- update myth-auth and codeigniter to latest develop changes
- improve permission check: remove all
dynamic permissions per podcast and overwrite myth-auth services and permission filter
- remove
unnecessary code because of myth-auth upgrade
- refactor some controller code for better clarity
-
add remaining seeders in docs

closes #19, #20

app/Views/admin/user/edit.php

@@ -0,0 +1,33 @@
+<?= $this->extend('admin/_layout') ?>
+
+<?= $this->section('title') ?>
+<?= lang('User.edit_roles', ['username' => $user->username]) ?>
+<?= $this->endSection() ?>
+
+
+<?= $this->section('content') ?>
+
+<form action="<?= route_to(
+    'user_edit',
+    $user->id
+) ?>" method="post" class="flex flex-col max-w-lg">
+    <?= csrf_field() ?>
+
+    <label for="roles"><?= lang('User.form.roles') ?></label>
+    <select id="roles" name="roles[]" autocomplete="off" class="mb-6 form-multiselect" multiple>
+        <?php foreach ($roles as $role): ?>
+            <option value="<?= $role->id ?>"
+            <?php if (
+                in_array($role->name, $user->roles)
+            ): ?> selected <?php endif; ?>>
+                <?= $role->name ?>
+            </option>
+        <?php endforeach; ?>
+    </select>
+
+    <button type="submit" class="px-4 py-2 ml-auto border">
+        <?= lang('User.form.submit_edit') ?>
+    </button>
+</form>
+
+<?= $this->endSection() ?>