[issue13611] Integrate ElementC14N module into xml.etree package

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

"c14n" is documented as an accepted serialization method of write() and there is some (non-working) code for support of C14N. e6a951b83e30b3b9c809a441041fb0f21f72b168 removed optional import of ElementC14N.

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