pokemon-showdown v0.11.6

semver? what's that? Seriously, though, the major breaking changes are all in undocumented APIs.

Notable changes include:

• A new Dex API (#8181)

• lobby is no longer special-cased (messages without a roomid now always get sent to console rather than lobby)

• A new challenge API (#8303)

• A new system for specifying battle rules with numbers and other options (#8267)