Generate structs for structs and fix struct out parameter if known (#8)

* Generate structs for structs and fix struct out parameter if known

* fmt

tests/ProxyInterfaceSourceGeneratorTests/Source/Disposable/RevitLocationPointProxyExtras.cs

@@ -1,10 +1,6 @@
 namespace ProxyInterfaceSourceGeneratorTests.Source.Disposable;
 
-
-
-public interface IRevitLocationPoint : IRevitLocation
-{
-}
+public interface IRevitLocationPoint : IRevitLocation { }
 
 public interface IRevitLocationCurve : IRevitLocation
 {
@@ -15,12 +11,15 @@ public class LocationPoint : Location
 {
     public XYZ Point => throw new NotImplementedException();
 }
+
 public class Location : APIObject { }
+
 public class APIObject { }
+
 public class XYZ { }
-public interface IRevitLocation
-{
-}
+
+public interface IRevitLocation { }
+
 public interface IRevitCurve
 {
     double Length { get; }