[Draft] [D3D] Support variable refresh rate displays (vsync off) in borderless windowed

[duckdoom4]

I made an attempt to improve support for vsync off in borderless windowed mode. (See https://learn.microsoft.com/en-us/windows/win32/direct3ddxgi/variable-refresh-rate-displays)

The documentation recommends we no longer use DXGI_SWAP_EFFECT_DISCARD and switch to DXGI_SWAP_EFFECT_FLIP_* instead.

Still TODO:

• [ ] MSAA is not supported in this model. The dx11 implementation will need to be updated to support this. There is a detailed explaination on how to resolve that here. (Would love your help with this one, I assume we can use an almost exact copy of the dx12 implementation?)
• [x] Disable tearing if fullscreen exclusive mode is active
• [x] Verify the code will work under different configurations
• [ ] Update the dx11 code so it matches the dx12 version? (Aka. use device to create swap chain, and move tearing support check to device as well)

Let me know what you think, would love your feedback :)

[LukasBanana]

Changes look good at first glance. I'll take a closer look and test this on Thursday.

[duckdoom4]

Had a bussy week, but got the comments addressed now.

Added the fallback to the next lower factory version on failure, and added the fallback to the next swap chain version on failure by adding a new function to make it more readable

[duckdoom4]

Yeah you're welcome. Happy to help. I'm actually looking at adding some other features as well so might make some more in the near future.

For example adding support for HDR framebuffer output for HDR displays.

Also I need bindless textures for a research project I'm working on. Does LLGL support that currently? I already read that dx11 does not support that,since it's a shader model 5.1 thing

[LukasBanana]

Added support for multi-sampled back-buffers with the FLIP swap-effect with 5778b34.