Passing frag as argument

It would be fairly easy and confortable to implement. I've done it in the cloned repo but I get errors when passing relative paths and running chipgl symlinked. If not I would submit a PR, but I'm not a C++ dev myself so I don't really know how to solve it.

[Polyrhythm]

Hey @devdevnullnull, sorry I didn't stay on top of my repo to see your issue. I think this would be a good addition. I am not currently set up to dev on my POCKET Chip and get this sorted, but I will leave this open if I do find some time to get it going again. In the meantime, feel free to submit a PR if you find a workaround for your issue.