Update extension used by Technique files

[istathar]

Ironically, the compiler itself doesn't actually care about the extension of the input file, but the samples in the repository needed updating to the new .tq extension.

Bumps major version to 0.4, representing both this change and the milestone of having completed the first iteration of the v1 parser!

While we're at it, move the golden test examples to tests/golden/, other examples that we expect to parse but not necessarily be perfectly formatted (after all, that's the whole point of the parser being as permissive as possible) to tests/sample/, and known-bad edge cases to tests/broken/.

This allows us to run the known-good and known-bad examples through the parser as part of the test suite, so we've added an additional test to do that.

[istathar]

Implements

• Change default file extension to .tq specification#1