Generated comments, if any, for properties. Fixed a possible crash with the multiple inheritance.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -1071,6 +1071,7 @@ namespace CppSharp.Generators.CSharp
                 if (prop.Parameters.Count > 0 && prop.Type.IsPointerToPrimitiveType())
                     type = ((PointerType) prop.Type).Pointee;
 
+                GenerateDeclarationCommon(prop);
                 if (prop.ExplicitInterfaceImpl == null)
                 {
                     Write(Helpers.GetAccess(prop.Access));

src/Generator/Passes/MultipleInheritancePass.cs

@@ -82,7 +82,7 @@ namespace CppSharp.Passes
                 instance.Namespace = @interface;
                 instance.Name = Helpers.InstanceIdentifier;
                 instance.QualifiedType = new QualifiedType(new BuiltinType(PrimitiveType.IntPtr));
-                instance.GetMethod = new Method();
+                instance.GetMethod = new Method { Namespace = @interface };
                 @interface.Properties.Add(instance);
             }