Also remove `*` chars from <b> and <strong> elements and change <hr> to use
box drawing Unicode chars.

This issue was addressed for htmLawed, where the UTF-8 version of a
non-breaking space, 0xc2a0 would be collapsed to 0xa0, which would very
likely create an invalid Unicode character, and the text block would be
dropped or truncated.

Until we add text/plain bodies to the ticket thread without an enclosing
<pre> element, we should not treat the <pre> element like a code or
blockquote block.

Also, add footnotes to the bottom of the rendered document for links that
are longer than half the document width.

Fix preg_replace bugs

If the xml extension for php is not loaded, this patch will do a better job
of honoring line break hints in the html.

Provide fallback html2text mechanism if PHP xml extension is not available

Including adding support to the TCL uninitialized variable reader to ignore
class-static variable access as well as detect inline functions and their
closure arguments.

Process inline attachments in thread entry and support inline images in
piped emails

Support inline images across the system, with draft support

Migrate to a single attachment table
    That way we don't need a new table for everything we need to attach an
    inline image to (like a signature, for instance)

Add richtext support for internal notes

Implement images on site pages

* Image paste in Redactor
* Make non-local images optional
* Placeholder for non-local images
* Fix local image download hover
* Don't re-attach inline images