added Mac OS nightly builds (#8)

* Only x86_64 builds are supported for the time being.
  They have been tested on Mac OS 10.15 (Darling) and 11 (thanks to @dertuxmalwieder).
* Curses glitches remain on Mac OS as reported by @dertuxmalwieder.
  Under Darling with a Linux terminal emulator, everything looks as it should.
* We don't build AppBundles or pkg installers but instead came up with a rather
  ideosyncratic way of packaging:
  The packages are tarballs of the installation tree with all dependant libraries
  added under /usr/local/lib/sciteco - thanks to dylibbundler.
  The archives are supposed to be unpacked into the UNIX tree root (`tar -C / -xf sciteco.tar`)
  and it will be necessary to "de-quarantine" all the binaries.
  Details will be documented in the wiki:
  https://github.com/rhaberkorn/sciteco/wiki/Mac-OS-Support
* Perhaps we will also ship an installation script (TODO).
* AppBundles would have the disadvantage that they cannot be directly installed
  into $PATH. On the other hand, this would be relatively easy to do afterwards.
  An AppBundle would need certain code adaptions for Mac OS, though.
* Gtk+ builds are not yet supported as I cannot test them with "Darling".
* All Nightly Build artifact names now mention the target architecture.
* build Win32 nightly builds with windows-2019
  * May improve compatibility slightly in the future as we should
    always build our binaries on the oldest possible system.
  * Does not change anything currently since windows-2019 == windows-latest.
  * CI still uses windows-latest and may therefore one day switch to windows-2022.
 * updated README

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