Clarify licensing of examples distributed with source code

[bernd]

If you have time to make a PR that is the easiest, but if you don't I can take care of doing it.

What exactly do I need to change and where?

[chennes]

The files listed in this PR: https://github.com/FreeCAD/FreeCAD/issues/8894

Need to be opened and re-saved with a CC-4.0 license, instead of the current "All Rights Reserved" license.

[chennes]

@bernd I changed four of the five that you directly authored here: https://github.com/FreeCAD/FreeCAD/pull/8933

I can't load src/Mod/Fem/femtest/data/open/all_objects_de9b3fb438.FCStd with my copy of FreeCAD, though, so I didn't change that one.

[PrzemoF]

I got an email asking me to reply to this topic regarding licensing of the files I contributed. Please amend/change the licence to whatever is needed - that applies to whatever I contributed to the FreeCAD project.

The file in question was: cube.fcstd