Jquery update (#290)

Bump tablesorter version to 2.3.0

Tablesorter only requires jquery 1.2.6+ which is long deprecated.
I've updated deprecated functions in Tablesorter and raised the required version to jQuery 3.5+

Updated deprecated jquery functions in toolbar.js as well. I'm sure there are more but I've cleaned up the obvious ones that seem to be throwing most console warnings.

Author: jeffwidman