Fixed methods generated by FunctionToInstanceMethodPass and FunctionToStaticMethodPass, to use parent class Namespace and keep function Namespace as OriginalNamespace.

src/Generator/Passes/FunctionToInstanceMethodPass.cs

@@ -44,6 +44,7 @@ namespace CppSharp.Passes
             var method = new Method()
                 {
                     Namespace = @class,
+                    OriginalNamespace = function.Namespace,
                     Name = function.Name,
                     OriginalName = function.OriginalName,
                     Mangled = function.Mangled,

src/Generator/Passes/FunctionToStaticMethodPass.cs

@@ -33,7 +33,8 @@ namespace CppSharp.Passes
             // Create a new fake method so it acts as a static method.
             var method = new Method()
             {
-                Namespace = @class.Namespace,
+                Namespace = @class,
+                OriginalNamespace = function.Namespace,
                 Name = name,
                 OriginalName = function.OriginalName,
                 Mangled = function.Mangled,