New item field "Post-type" and new table "permissionset" (#5408)

* "post-type" replaces "bookmark" and "type"

* Removed some more type

* Added index to permission set

* The permission set is now stored

* The permission set is now removed upon expiry

* Post update now stores the permission set

* New file

* Permissions are now sorted

* Changed documentation

mod/editpost.php

@@ -110,7 +110,8 @@ function editpost_content(App $a) {
 		'$shortnoloc' => L10n::t('clear location'),
 		'$wait' => L10n::t('Please wait'),
 		'$permset' => L10n::t('Permission settings'),
-		'$ptyp' => $item['type'],
+		'$wall' => $item['wall'],
+		'$posttype' => $item['post-type'],
 		'$content' => undo_post_tagging($item['body']),
 		'$post_id' => $post_id,
 		'$baseurl' => System::baseUrl(),