test: Update tests to latest tytanic spec

[dybucc]

tytanic reports nested tests as being deprecated, and eventually ignored in later versions. This PR simply pushes the changes performed by tytanic's own util migrate --confirm subcommands and flag.

From skimming the diff, changes only include adding a more fine-grained directory structure and .gitignore files to both the out/ and dif/ subdirectories of each test, as those contain the resulting output of the test and the diff with the file in ref/, respectively.

While running tests, I also noticed the tree test failed. The circles surrounding the areas of the numbers were completely out of place, and it doesn't seem like the test in question has had any major changes in recent commits, so it may be that Typst's internals have modified something in the layout engine of more recent versions (seeing how tytanic doesn't seem to support Typst compiler versions beyond those of specific tytanic versions [1].) It seems unrelated to CeTZ, but I can't say for sure. What I can say is that the latest commit that changed the reference image for that specific test didn't change the test.typ file. Simply from observation alone, the resulting reference seems unmodified, but it could be there were some minor positioning changes. Either way, I've tried solving the test, and getting it to look half-decent again, but I've not opened a PR just yet because I'd require also updating the reference with tytanic's corresponding command, and that's just pushing my luck with someone else's project.

[johannes-wolf]

There is a .gitignore file in the /tests/ directory that handles all the tytanic related files; no need to add it to every test case.

The default transformation matrix changed to an identity which might cause the problem.
Befor that change, some code had to flip the y-coordinate.

[dybucc]

Done. My bad on the tree test; I don't know enough about the codebase yet to try to understand how to fix it.

Now tytanic shouldn't complain about nested tests anymore, and the additional .gitignore files have been removed.

[johannes-wolf]

Thank you! I will look into fixing the tree test soon.