Investigate setting DX12 as the default Windows renderer

[hhyyrylainen]

Once we switch to Godot 4.6 that'll be the default for new projects. And as we quite regularly get Vulkan initialization error reports from players, I think it would be worth it to test switching to directx for Windows by default.

To use this new default in pre-existing Godot 4.5 projects, you should set the rendering/rendering_device/driver.windows project setting to d3d12 manually.

[Zireael07]

Tbf there's an influx of people reporting bugs/artifacts not present before and most of those are due to the switch to DX12. It seems that both renderers have their own share of issues

[hhyyrylainen]

So we might actually want to wait a couple of Godot releases for the initial DX12 bugs to be worked out... Thanks for the info.