Cometary does not work in Visual Studio by itself

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In its current state, Cometary does not run when building in Visual Studio, due to an error resolving dependencies, which is bad for the debugging experience. I'll try finding a way to make it work fine.

In the meantime, the following workaround works:

• Build in Visual Studio, which may lead to a failure (in any case, the analyzer shouldn't be able to run);
• Build using dotnet build or csc, which will also run the analyzer without a problem;
• "Run" or "Debug" in Visual Studio, which will now use the previously produced assemblies.

I've thought about multiple ways to make this work. I don't exactly remember what I tried (and I tried many different solutions), but IIRC the way to go is to specify manually the executable for Roslyn, which shouldn't have a problem like VS' one.