Add simple example of library usage and consuming generated output

[Wulf]

Adds a simple example that we use as a compilation test.

We'll need to expand this going forward to ensure robustness

Note: This will fail until #104 is merged in as that fixes a few compilation issues with once_common_* flags

[hasezoey]

i change the title of this PR to better reflect what this PR is doing

[Wulf]

@hasezoey please give this another look when you have the time. It's been a long time since we visited this, so feel free to suggest another approach entirely.