Prevent mentions from mangling by markdown parser

Mentioning people whose handles include valid markdown would not survive
markdown to bbcode conversion wihout being mangled. An example that
brought this to my attention was a handle similar to this:

    _someuser_@testsite.example

The underscores would be interpreted as emphasis in markdown, and
converted to:

    [i]someuser[/i]@testsite.example

This patch should fix this, and hopefully any other issue with mentions
being mangled.

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