552 big refactoring - #557

…eInfoFrame.OnMotion()`.

…version` module.

…tly.

…er` as the pointed out `/tmp` is not a directory path.

…g errors on all source files.

…xec_cmd()`.

…introduced with 28d8ba9.

…instead of `codecs.open()`.

Fix Web @ localhost polling and color updates so browser clients recover from transient errors, preserve session continuity, and render accurate patch colors. Also align Linux and macOS install docs with the lowercase `displaycal-*.whl` wheel naming used by current build output.

…ilds

Include typing_extensions in build-system requirements for Python < 3.11 so PEP 517 isolated builds do not fail when setup imports DisplayCAL.util_os.

[#552] Improve Web @ localhost stability and continuity

…ICES` (why was this missing???).

…should reduce the test duration by a minute or so (30% reduction).

…and does not try to create a file handle and return it at all.

…uppose to be.

…ilures.

…failures.

…ons.

Now that the tests are stabilized, added matrix of wxPython versions for macOS tests as in Linux and Windows tests.

…p.py`.