This commit fixes 2 issues we had with using MPDF to export Tickets:

1. Tickets with inline images
	To refer to images as var:varname, imageVars needs to be set for the MPDF object.
2. Tickets with tables
	When exporting a Ticket where a Thread Entry contains a table, we must ignore table percents and table widths, otherwise, it will always throw the error "Word is too long to fit in table"