* Update serendipity_event_custom_permalinks.php
changes necessary to PHP8.2. there was an undeclared const variable. changed it to string-value
* Update ChangeLog
changed version to 1.17.1 and added information to changelog file
* Update serendipity_event_custom_permalinks.php
increased version
Iconfont icons are of no value to screenreader users; in our case,
they get alternative text. By adding 'aria-hidden="true"' to the
<span> holding the iconfont icon, we avoid the screenreader trying
to announce the iconfont icon.
This commit is to ensure consistency with the core across the
additional_plugins repository. While I was at it, I also cleaned
up the ChangeLogs, trying to establish a common pattern.
