Remove assembly signing

[Roald87]

Github secrets are not available to forked repos. That's why the piplines of the PR's failed from others than mine.

Singing would only be necessary in case of publishing a release. So, it should be possible to remove the required signature when it goes into the pipeline for only builds and tests.

[Roald87]

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/compiler-options/security

[Roald87]

Asked a question on stackoverflow.

[Roald87]

Bounties the StackOverflow question. If there is no answer, I'll remove the singing. It causes too much trouble.

[Roald87]

See also #65

[Roald87]

Removing the singing. This is causing so many headaches and frankly I do not understand the advantages.