Implement a "multi layer" contract #162
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A form of hybrid contract between 'layers' and 'independence'. Where modules declared on the same level are independent from each other while they individually honor their "lower layers".
(Hopefully) Fixes #157
This is just a port of a contract I created for one of our projects quite a while ago. I tried to hook it up in to the test suite a bit. I can barely recall the approach taken in here. But could refresh my mind if the contract is of interest.
Feel free to do what you want with it, if only for inspiration. I didn't bother resolving any type checking or other CI fixes until it would be of interest to merge.