Linting and Formatting

[filmor]

• Add formatting and linting for C# files
• Format and fix lints in Python (test) code

[filmor]

I must have messed something up in the C# code while trying to fix the NonCopyableAnalyzer reports. To be honest, at this point I'm not sure how much this one actually helps, seeing that patterns like return NewReference(...) are wrongly reported.

[lostmsu]

Just doublechecking for C#: this change does the proper thing in regards to our .editorconfig? E.g. all settings default except the one set there?

[lostmsu]

TBH, I am not sure formatting is important unless it is in some way extreme.