[Suggestion] Populate can highlight pin / net

[mundodisco8]

Hi! thanks for the tool, it's really handy!

I was building a simple assembly guide, and I was thinking that it would be great if the language could be extended to highlight pins in a part, to add instructions like "test the pin 3 of U1" or things like that. Alternatively, if it's easier (I don't know how much metadata you can extract from a PCB file), maybe you could highlight a net, so instead of saying "test the voltage in pin 1 of U1" you could tell the user all the available test points for a given signal (in case other points are easier to access).

Just a suggestion. Again, thanks for your effort!