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)