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
If the module is enabled (default), 3D physics works as it did before.
If the module is disabled and no other 3D physics server is registered
(via a module or GDExtension), then we fall back to a dummy
implementation which effectively disables 3D physics functionality (and
a warning is printed).
The dummy 3D physics server can also be selected explicitly, in which
case no warning is printed.
