Update build system

[vortexofdoom]

The current build system is not ideal for dropping straight into a project. The ultimate goal is to allow users to simply add this library as a dependency in their build.zig.zon and building from their own project, with as little additional configuration as possible.

The following list of tasks is not final:

• [ ] Expose the ability to compile to ARM code, and link it to IWRAM automatically
• [ ] Move compilation utilities into a utils module (such as the above) so that users can easily choose how their code is compiled without getting deep into the weeds of the build system.