Add support for function pointers and `calli` to the IL->C# translator

[slxdy]

• What version did you use? CI build #251, .NET Framework

• Original code (aka expected result)

• Generated IL code

• Translated C# code

[ElektroKill]

Hi, support for C# 9.0 function pointers will come when dnSpyEx is updated to use the latest version of the ILSpy decompiler engine. The current ILSpy 2.4 decompilation engine does not support these constructs as it was written before they were even conceptualized. Adding support for this language feature to the old decompiler engine would be an exercise in frustration due to certain architecture issues with the ILSpy 2.4 engine.

The update to the newer engine is tracked by: https://github.com/dnSpyEx/dnSpy/issues/5

[sunnamed434]

Good one