Unescape html before urlencode in mailto link for RFS template

Baptiste Beauplatrequested to merge
lyknode/debexpo:fix/rfs-template-html-encoding into live

The mailto link for the RFS templates is urlencoded and html escaped. The html escaping is unnecessary and creates literals character (for instance: >) in mail clients.

This MR unescape the html produced by the Make templating system.

Changes are covered in debexpo/tests/importer/plugins/test_rfstemplate.py. Tested locally as well with UTF-8 characters in RFS template.

Note: HTMLParser is part of the standard python lib.

Closes: #90 (closed)

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