Fix up diagnostics

- Show all diagnostics and the relevant location in project.json
even for transitive dependencies
- Removed LibraryRange from LibraryDescription and added a list instead
- Show stack traces in debug mode
- Fixed LibraryType.GetHashCode()

src/Microsoft.DotNet.Tools.Compiler/Program.cs

@@ -66,7 +66,11 @@ namespace Microsoft.DotNet.Tools.Compiler
             }
             catch (Exception ex)
             {
+#if DEBUG
+                Console.Error.WriteLine(ex);
+#else
                 Console.Error.WriteLine(ex.Message);
+#endif
                 return 1;
             }
         }