wurstminebot 3.10.0 — !UltraSoftcore poll and rewritten !Cloud

This release adds 2 new features: a poll subcommand for !UltraSoftcore, and a rewrite of !Cloud.

!UltraSoftcore poll allows users to retrieve the link for the next planned USC, and allows bot ops to update or delete it. The link will automatically be included in the main channel's topic.

!Cloud has been updated for a change in the assets.wurstmineberg.de files: Cloud info has been moved out of items.json and into its own file, cloud.json. The reply has also been rewritten to include the item name and the z position of the item (the row number and wall of the chest within the corridor).