include @greezybacon suggestion on fix

Fixes #2350 in `develop`

Fix case where collaborators were not being alerted
Alert admin last on new ticket - just in case admin email is used by an agent.

This patch changes the way the thread entry type and other properties are
determined by using the userClass determined in the Mailer::decodeMessageId
method which is preferred over the older heuristic methodology using the
`From` email address alone.

When saving an attached file in the database, Passing the whole content of the file to bin2hex leads to allocating the memory for the whole hex encoded file while the binary content of the file is still in memory. This leads easily to Out of memory error on limited resources servers. Calling bin2hex on each chunk of the file greatly limits the memory usage.

This time, use full-text for user and ticket lookup boxes, and drop the
full-table scans from the ticket basic search page. Auto promote searches to
wildcard searches when searching with the user-supplied input yields no
results.

Also, apply requested state to the user and organization tickets search.

If the subject field is something crazy, such as an HTML field, ensure that
the layout of the ticket queue is preserved and properly truncated.
Furthermore, ensure that the HTML is properly rendered on the client and
staff ticket view pages.

Fixes #2433

Fixes #2410

The system would encode 'access -related' as 'access+-related' when changing
the sorting preference and would crash the query. This patch fixes the
search engine code to avoid a BOOLEAN MODE search when improper operators
are used in the query terms, and it fixes the sorting preference system to
properly decode the '+' to a space when rewriting the URL.

Drop the 25 rule limit