[xml] rewrite schema directed serialization/deserialization methods

The new implementations of lasso_node_impl_init_from_xml now validate
namespace of all child nodes befores parsing. It stops on any error. For
node which implement their own parsing of an attribute or a node, it
must declare an XmlSnippet with an offset field set to 0. The 0 value is
invalid for public GObject structure (it's the place of the GObject
machinery like the reference count). The 0 offset can be used for
XmlSnippet in a private structure, so never set the offset to 0 with the
flag SNIPPET_PRIVATE, for a field which is parsed by you get_xmlNode
virtual method.

Other ameliorations in this commit is the possibility to set attributes
with namespace when using the flags SNIPPET_ATTRIBUTE|SNIPPET_ANY. The
syntax for an attribute is inspired by the element tree API from Python:

	{namespace}attribute_name

an example:

	{http://www.w3.org/2001/XMLSchema-instance}type

for the classic xsi:type attribute.

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