Platform-Specific Resources in SwiftPM

Noise packages Racket & Chez Scheme boot files 1 for all the platforms it supports. Originally, that was just x86-64 and arm64 macOS, but when I added iOS support, that extended to include arm64 iOS. These boot files take up about 45MB for each arch+os pair and the way I originally distributed them was placing them all in a boot folder and adding them to the resources list for the core Noise…