Pytest fixes for windows

[lwid]

As pointed out in #166 there are some tests which still fail on Windows due to various reasons. This PR makes the test suite pass.

• The os.sep commit should be trivial to understand.
• For the CLI tests it was not, as expected, the newlines causing problems but rather it was the Table generator using different sets of unicode chars for rendering the table on win32 compared to other OS:s. This seems to be a known issue with rich. These test we modified to be more tolerant and less strict on formatting.
• The redownload test fails due to the sqlite file being opened by the test harness which causes the unlink to fail. Getting this to work would require severe refactoring so I added a condiitional skip for this very test when running on win32. Out of the options I could think of this seems the most reasonable on.

With these three commits I now get a clean pytest run on Windows (with explicit skipping of the redownload test in the log).

Please verify that the tests function as before on your prefered platforms and that you are fine with the modified CLI tests.

[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.91%. Comparing base (a1e3de0) to head (79b84a7).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
actual/__init__.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #167   +/-   ##
=======================================
  Coverage   97.90%   97.91%           
=======================================
  Files          19       19           
  Lines        2677     2680    +3     
=======================================
+ Hits         2621     2624    +3     
  Misses         56       56           

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[bvanelli]

After some headache with the sqlite3 library, the last test is now fixed for Windows (at my machine). Turns out, if you don't call the conn.close() after leaving the context manager, it doesn't do anything on Windows.

The codecov we can ignore, it likes to complain about single uncovered lines.

Could you confirm it also works in your machine too? Then we can merge it.

[lwid]

Verified, works perfectly and now I get a 100% Pass ratio. Nice!