xmpp-parsers: Stop reexporting extra symbols

Let’s continue reexporting jid and minidom, but not their inner pub
items, users of this crate can go one level deeper if they need that.

Only xso::error::Error is still useful to reexport, as this is part of
the public API of all of our parsers.

parsers/src/pubsub/mod.rs

@@ -18,7 +18,8 @@ pub use self::event::PubSubEvent;
 pub use self::owner::PubSubOwner;
 pub use self::pubsub::PubSub;
 
-use crate::{Element, Jid};
+use jid::Jid;
+use minidom::Element;
 
 generate_id!(
     /// The name of a PubSub node, used to identify it on a JID.
@@ -105,4 +106,4 @@ impl Item {
 }
 
 /// This trait should be implemented on any element which can be included as a PubSub payload.
-pub trait PubSubPayload: ::std::convert::TryFrom<crate::Element> + Into<crate::Element> {}
+pub trait PubSubPayload: TryFrom<Element> + Into<Element> {}