feat(make): cli depends on API, generically

This allows us to build efficiently. CLI programs can now have their
own cmn.rs implementation, which we can test standalone with
`cargo test`.

The primary makefile currently just explicitly pulls in the type-*.yaml,
one day we could possibly put it into a loop.

Fixes #11

src/rust/cli/mod.rs

@@ -0,0 +1 @@
+pub mod cmn;