[Renderers/GDI] Add native Windows GDI renderer

[Ch40zz]

It would be awesome if a very simple native Windows GDI renderer could be added to the project to easily create windows UI applications without any third party dependencies at all!
I expect it to not be much work as GDI is pretty easy to use compared to modern DirectX and OpenGL setup.

After doing some research, a very popular layout + rendering framework ImGUI used to have a PR for GDI but it was never merged so as it stands right now, this could be a feature drawing in some people from ImGUI as they don't have an official GDI backend to this day. Yes this is rather niche but theres quite a few people who need non-3D renderers.

[hexmaster111]

I'm working on one right now, it's not perfect, and I am yet to publish it. But here is a little sneak peak,

[nicbarker]

Wow @hexmaster111 it's looking great already!

[Ch40zz]

I'm working on one right now, it's not perfect, and I am yet to publish it. But here is a little sneak peak,

That looks amazing, happy this is already in progress! <3

[hexmaster111]

Thanks for all the positive words! It's getting close as the day goes on!

And I've gotten clipping working now!

Next up I am going to get the CLAY_RENDER_COMMAND_TYPE_BORDER~

[hexmaster111]

FYI, in pr #322