Loads shared libraries compiled from 'Zig' ('.so' files on Linux, '.dll' files on Windows) and binds their exported functions to R functions. Arguments are passed by value using the native calling convention, so functions with mixed integer, double, logical, string and vector arguments and with return values can be called. Also compiles and runs 'Zig' code directly from R. Compiling code requires the 'Zig' compiler.