Conformance corpus

The .clj files here are the test suite of the original mino interpreter (https://github.com/leifericf/mino), copied verbatim at commit ead6e160, the version mino-rs was ported from. tests/conformance.rs runs each file against this crate. They are MIT-licensed (see LICENSE).

Upstream mino is archived. These files are ours to maintain now: fix a test here when it encodes a bug, and add tests for bugs we find.