### Breaking - dial: moved network dialing types and functions into new package. - dial: use underlying net.Dialer's DNS Resolver in Dialer. - stanza: change API of `WrapIQ` and `WrapPresence` to not abuse pointers - xmpp: add new `SendIQ` API and remove response from `Send` and `SendElement` ### Fixed - xmpp: let `Session.Close` operate concurrently with `SendElement` et al.