unicode

We can allocate those two in one vector allocation for all upon first non-nullptr setter. That would shrink hb_font_funcs_t by over 50%. Saves 33 pointers!

We do not (want to) support multiple installed versions anyways. So let's get rid of the version component in the program folder.

Checklist

• install into path not containing the app version
• auto-updater.
• put contour.exe's app path into the user's (/system's) search path.
• ensure font metrics when moving window to different screen with different DPI scale.

• Cleanup the tests
• Move module-specific tests into their own modules
• Rename the test case functions as we do in benchmarks

From unicode-org/icu4x#1873 (comment), "Having icu_datetime::pattern::reference::pattern::Pattern and icu_datetime::pattern::runtime::pattern::Pattern makes this super confusing to review, as opposed to having a struct named ReferencePattern and RuntimePattern"

These are internal structures, so we don't need to do this prior to ICU4X 1.0.