Netpd as macOS app

I modified the official for macOS to include externals, netpd and instruments. The idea is to provide an easy entry to netpd for non-Pd users. Bevis helped me with testing and it looks usuable, though I consider it still experimental in that things might still change. Feel free to test and post your experiences here.

Hi guys
Thanks heaps for this!
Tried it on my new and my old mac and it worked like a charm.

Thanks for the feedback. So I make this official. I wonder whether it also works under Catalina. I don’t have a Catalina machine to test, I only have access to Sierra.

Here we go with a more final version that contains a few fixes and new Pd 0.51: