[IMP] tools: sanitizer: quote detection

Quote detection is now done in the sanitizer itself. It tags nodes that are
inside quotes (signature, text quotes, email quotes). The purpose is to remove
html_email_clean and have all the html cleaning / sanitizing inside a single
function. When a node is tagged, data-o-mail-quote is set on the node.
This attribute is added in the whitelist of valid attributes for the
sanitizer.

[REM] Support of shortening messages. The read more / read less will only
display or hide detected quotes and signatures. Shortening messages above
a given amount of characters is not supported anymore. Indeed it adds much
complexity to the sanitizer without adding much value to the result. The
primary purpose of the sanitizer is indeed to remove noise and unnecessary
content.

[TESTS] a lot of test are not necessary anymore, as read more / read less
display will be moved in the front-end and as the shortening has been
removed.Tests have therefore been cleaned and simplified.

[DEMO] mail: small demo update to include a bit quote detection

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