Moves to .NET Standard 2.1 SDK level, enabling almost all of the APIs that .NET 5 offers. (Godot supports .NET Standard 2.1 but documentation is conflicting on how it feels about .NET 5 so I'm not pushing my luck.)
Closes #13 but does not actually enable or migrate to nullability annotations - that's up next.
Moves to .NET Standard 2.1 SDK level, enabling almost all of the APIs that .NET 5 offers. (Godot supports .NET Standard 2.1 but documentation is conflicting on how it feels about .NET 5 so I'm not pushing my luck.)
Closes #13 but does not actually enable or migrate to nullability annotations - that's up next.