Roslyn Analyzer #67

There's a very common problem using Locator, which is that the natural code change to use it:

 void DoStuff()
 {
+    MSBuildLocator.RegisterDefaults();
     var project = new Microsoft.Build.Evaluation.Project(projectPath);

Doesn't work, because .NET loads all types referenced in a method before executing that method, so it tries to load MSBuild APIs before the Locator has made that possible.

#64 is one example of this but there have been a ton.

We can't fix this in the deployed code, because it won't have been loaded in time to do anything.

It might be possible, though, to create a Roslyn analyzer that ships as part of this package that checks to make sure there are no MSBuild APIs in a method that calls the locator. That would make things much easier for new users.