Fix remaining Path aliasing issues by adding support for R32F framebuffer format

[EVAST9919]

Issue

While #6767 is good enough for most cases, there are still cases where it fails. There underlying issue - Max blending used for solving path intersections isn't working correctly with our encoded sdf value. It selects max value per component while with our encoded value we would need it to select the color with the first max component.
Example:
pixel 1 - 0.5, 0.5, 0.5, 0.5
pixel2 - 0.5, 0.6, 0.1, 0.1
Current resulted color - 0.5, 0.6, 0.5, 0.5 (max per component, blends colors)
Desired color - 0.5, 0.6, 0.1, 0.1 (green value is bigger - full pixel2 color should be the result)

Solution

By adding support for R32F (32-bit single-channel) texture format Max will work as expected since there's only a single value to compare. We also can store 32-bit float SDF directly in the texture without encoding/decoding step with the same memory usage per texture.

master	pr

Performance:
Tested with the most complex aspire slider I could find (tens of thousands of vertices) and it's basically the same

master	pr

Tested on windows with all 3 renderers, mobile/mac probably needs testing as well.

[smoogipoo]

Works well, lgtm!

The only concern I have is the ordering of the new texture format args, but I can understand why it was done this way and agree it makes sense. Regardless this won't require any changes osu!-side so that's good 👍