[MERGE] [RFC] Split xml-independent bits out of bzrlib.xml_serializer.

[Jelmer Vernooij]

This moves the Serializer class and the serializer registry 
out of xml_serializer into a new bzrlib.serializer module, in preparation of 
a Serializer that doesn't use any XML.

This makes the interface a bit cleaner and should hopefully also mean not 
loading any XML modules unless a XML serializer is used. 

This moves format_registry and Serializer to a different location; should 
they be deprecated or is removal ok in their case? (is there anybody out 
there with custom serializers ?)

Cheers,

Jelmer
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