MacOS plugin build scripts

Usage:

First get this repo:

git clone --recurse-submodule https://github.com/madskjeldgaard/sc-plugins-build-scripts
cd sc-plugins-build-scripts

Then run one of the build scripts like so to build and install a plugin package:

./guttersynth-sc.sh x86_64

As you can see, the frst argumement is the target architecture. x86_64 is used if you run SC on an intel based mac or if you have SuperCollider installed under Rosetta on an M1-based mac. Otherwise use arm64.