PDCursesMod/WinGUI now uses the polling fallback again with a temporary workaround

* The keyboard hook required polling as well and was actually much less performant
  than the generic getch() polling fallback.
  Furthemore it did at least not work on Wine.
* We instead now release the WinGUI-internal mutex and yield the thread giving
  it some time to process new key presses.
* This workaround is temporary and will probably be part of the the next PDCursesMod-release
  (v4.3.4). We still want to support the latest MSYS/MinGW version though which is
  currently at v4.3.2.
  The fix will also currently only work when statically linking in libpdcurses_wingui.a.
  This is what we do for nightly builds.
  See also https://github.com/Bill-Gray/PDCursesMod/issues/197
* Once the fix is released upstream and into MSYS, we should probably bump our
  minimal required PDCursesMod version.
  The color-table workaround (cf9ffc0cec0d2e55930238d1752209bca659c96d) can then also be removed.
* We should also consider dropping official support for the classic PDCurses and support
  only PDCursesMod - this will allow us to simplify interfaces-curses/interface.c a bit.
  Support for classic PDCurses is probably broken by now anyway and trying to support it
  is just too much.

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