funcz: All the functional tools you need for zig

This is a work in progress library meant for bringing functional ideas to zig in easy to understand and reasonable ways.

To add the latest version to your project, simply run

$ zig fetch --save git+https://git.ngaffney.dev/funcz/#HEAD

And then in your build.zig, add the following:

const funczmod = b.dependency("funcz", .{
    .target = target,
    .optimize = optimize,
}).module("funcz");
exe.root_module.addImport("funcz", funczmod);