mod_muc_http_auth: Allow for enabling/disabling per user host IMPORTANT: This is a breaking change. The `muc_http_auth_enabled_for` and `muc_http_auth_disabled_for` options are now maps (with user hosts as keys) and not sets.

This module discards typing notifications sent to a bare host JID,
preventing error replies to be sent. These errors are harmless but can
be annoying sometimes if your client shows them prominently.