look speak about this here
https://github.com/osTicket/osTicket-1.7/issues/44

fixing CSS minification on default theme

changing ticket create/status bottons on client landing page, redoing navbar shadow with css, adding kb icons

Replace the ticket_{message,response,note} tables with a single
ticket_thread table that will contain data for all three current message
types. This simplifies much of the ticket thread code and paves the way for
other types of messages in the future.