v1.13

Maintenance release.

Release highlights:

• xml_attribute::set_value, xml_node::set_value and xml_text::set now have overloads that accept pointer to non-null-terminated string and size
• Fix error handling in xml_document::save_file that could result in the function succeeding while running out of disk space
• Fix memory leak during error handling of some out-of-memory conditions during xml_document::load

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