Experimental: Multiple piece - shapes

[Necktschnagge]

• replaces a part of Awkward Goslings #53, but not entirely

[Necktschnagge]

TODOs:

• fix the swan (pedantic) (add a swan svg emoji 🦢  #142)
• try to include svg file into compile process
  • in Future there may be some #embed directive (https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2725.htm)
• decide for padding

[Necktschnagge]

https://stackoverflow.com/questions/26161422/is-it-possible-to-read-a-file-at-compile-time

[Necktschnagge]

We might read the file at runtime and check for some checksum:

• Experimental: Include OpenSSL #143 tries to add OpenSSL to this project. Seems a little tiresome, especially on windows.

[Necktschnagge]

We need some cmake instructions for copying the svg files in the directory of the compiled binaries.

• See this: https://stackoverflow.com/questions/74041614/cmake-how-to-get-binary-target-complete-directory-and-name-on-windows
• https://stackoverflow.com/questions/34799916/copy-file-from-source-directory-to-binary-directory-using-cmake
• https://stackoverflow.com/a/65299063/6346852
• https://stackoverflow.com/questions/13429656/how-to-copy-contents-of-a-directory-into-build-directory-after-make-with-cmake

[Necktschnagge]

Let's just implement some very easy stuff for now, decide about how to integrate an external SVG later.

TODO:

• create Main menu items.
• enable balls instead of ducks.

[Necktschnagge]

@r0ost3r Can you please determine exactly which Qt version is running on Azure ubuntu20 Qt5 and which version on your local manchine?

Old Qt versions are again causing trouble because of missing member function of class QACtionGroup

[Necktschnagge]

In older Qt versions the following slot does not exists:
void QActionGroup::setExclusionPolicy(QActionGroup::ExclusionPolicy policy).

Fow now, I stopped using it.

[Necktschnagge]

This PR was kind of experimental, since we are still considering how to include the swan in an elegant way.

Let's create a spin of to merge all working parts.