Enhancement: Have some visual feedback if any tracing is turned on

It is all too easy to accidentally leave some \tracing{codes} left on in a .tex file and then wonder why PTXprint is working so slowly. So I would like there to be some indication in the UI that warns a user that it may run slower than expected due to tracing being on.

A few ideas on how to do this:
a) Color the Advanced tab label red instead of blue
b) Use a different color (like peach/orange) on the Print button (instead of the green)
c) Issue a status bar message when you hit print

We would need to (i) check if the mods.tex and pre-mods.tex files are enabled, and if so (ii) look/regex for certain strings like \tracing{.+} that aren't commented out. And only do any of this if in Full view.