Provide a means to get the system macOS font with monospaced digits

On macOS the Cocoa API provides a means to get the system font but with monospaced digits - https://developer.apple.com/documentation/appkit/nsfont/1528205-monospaceddigitsystemfontofsize?language=objc - which stops it from appearing to change the position of the digits when updating from 1 to 2 for instance. This would make it easier for numbers to be displayed which on Windows do have the same width even with proportional width fonts. A monospaced font is not ideal here because it is used for everything and not just digits and therefore it would look out of place and considerably different to other applications on the same setup.

There is more information about the problem in general with non monospaced digits here - https://blog.usejournal.com/proportional-vs-monospaced-numbers-when-to-use-which-one-in-order-to-avoid-wiggling-labels-e31b1c83e4d0 - which show cases the problems more clearly.