It is a Standard Term Support (STS) version and will be supported until Tiki 20.1 is released, as per the Tiki lifecyle policy
Use case: when a Tiki instance has a combined use case of a public website and a restricted Intranet, it's nice to have Piwik and / or Google Analytics for anonymous visitors to see most popular pages, time on site, etc. But for logged in users, it's not so interesting and it skews the stats.
- PluginXMPP permits to embed an XMPP chatroom in a wiki page
- https://tiki.org/forumthread66854 has been addressed (commit ID?)
Mods are completely obsolete. All mods-related code has been removed from Tiki.
ViewerJS, which includes WebODF, will no longer be supported because no significant work has been done since 2015
For PDF viewing, we will start using code directly from Mozilla's PDF.js, and installable via Packages.