Add missing includes

Add missing <winnt.h> include in windows/lang_table.h
Add missing typedefs.h and rid.h include in godot_constraint_3d.h
Add missing <type_traits> include in iterable.h
Add missing forward declarations in rendering_shader_library.h

Author: StarryWorm

core/templates/iterable.h

@@ -30,6 +30,8 @@
 
 #pragma once
 
+#include <type_traits>
+
 template <typename I>
 class Iterable {
 	I _begin;

modules/godot_physics_3d/godot_constraint_3d.h

@@ -30,6 +30,9 @@
 
 #pragma once
 
+#include "core/templates/rid.h"
+#include "core/typedefs.h"
+
 class GodotBody3D;
 class GodotSoftBody3D;
 

platform/windows/lang_table.h

@@ -30,6 +30,8 @@
 
 #pragma once
 
+#include <winnt.h>
+
 struct _WinLocale {
 	const char *locale;
 	int main_lang;

servers/rendering/rendering_shader_library.h

@@ -30,6 +30,10 @@
 
 #pragma once
 
+class String;
+template <typename T>
+class BitField;
+
 class RenderingShaderLibrary {
 public:
 	enum FeatureBits {