This branch/commit is only useful to those who purely use a clean Bukkit/Spigot/Paper API
and does not use NMS/OBC references.
This will let you start updating your plugin to the latest 1.13 builds of Bukkit Preview (4 as of now)
Note that this release is not final!!! API breakages may occur!
It is up to you if you find use out of this work.
The Component based methods are not even safe to use, as it may result in invalid items being sent to the client.
The string based method we have added is the only safe way to send with the API.
The client is stricter about componenents being sent for this API, and does not accept children components.
The client is expecting a legacy string.