HTML filter: ignore <xml></xml> that Microsoft word generates..

HTML filter: ignore <xml></xml> that Microsoft word generates..

Microsoft Word produces emails which make you shiver in disgust,
with lots of sections in <![endif]--><!--[if gte mso 9]>
conditionals, with <xml> blocks, tremendous amount of
<w:LsdException ../> tags, whatever this is, lots of styles, and
then <span>s with inline styles which override these for <p> with
class definitions.  What a mess.

Anyway, for these emails we yet would see elements with content
from within XML blocks, like, for example,

   <w:DocumentKind>DocumentEmail</w:DocumentKind>

resulting in output like

  [-- #1.2 1030/79034 text/html, base64, utf-8 --]

  120 Clean DocumentEmail 21 false false false DE X-NONE X-NONE

  Hi,

To avoid this, add <xml> to the list of elements we ignore.
And yes, these emails have a nifty size/content ratio.