Allow users to set the font size the way it worked in conhost

# Description of the new feature/enhancement

Currently, the font size options are slightly lower in granularity than Command Prompt or Powershell. You cannot match their default font size of 16. I understand moving away from using actual pixel measurements for the general user since CMD predates UI scaling and this system presumably is more consistent for that. However for the power user, the option to specify the exact pixel height is nice.

I propose that if the user enters a "px" suffix to the number in the font size input, it should be either translated to the matching font size or ideally just used directly.

At the very least greater granularity would be appreciated so that the font size can match that which it is supposed to replace. Thank you.