title: Ambiguous reference error in OpenApi-generated c# code
body: <p>I'm using OpenAPI Generator to generate client libraries for my c# API. I am having issues generating a c# client, because one of my models is called Environment. The generated service code to manipulate this model causes the build of the project to fail because it is an ambiguous reference between it's own model and .Net's System.Environment. </p>
  
  <p>The exact error I'm seeing is <code>
  Api/EnvironmentApi.cs(87,42): error CS0104: 'Environment' is an ambiguous reference between 'MyProject.Model.Environment' and 'System.Environment'</code></p>
  
  <p>Is there some way to tell openapi-generator to fully-qualify the class names in the generated code so that it won't clash? i.e. so it generates something like </p>
  
  <p><code>DoSomething&lt;MyProject.Model.Environment&gt;(...)</code> instead of <code>DoSomething&lt;Environment&gt;(...)</code></p>