Java Edition 1.12-pre7

1.12-pre7 is the seventh pre-release for 1.12.

Additions

 * Advancements
 * Added experience rewards to all "challenge" advancements


 * Splashes
 * "The true meaning of covfefe"
 * Reference to a cryptic tweet from Donald John Trump.
 * "An illusion! What are you hiding?"
 * "Something's not quite right..."