Also swaps the byte order from RGBA->BGRA to match GL/D3D12, and what
the read handler is expecting.

Depth reads will now return the minimum depth of all samples, instead of
the average of all samples.

Fixes warning C4334

The D3D backend was always forcing Anisotropic filtering when that is enabled regardless of how the game chose to configure the texture filtering registers; this causes the same issues as "Force Filtering" without Anisotropy, such as causing game UI elements to no longer line up adjacent correctly. Historically, OpenGL's Anisotropy support has always worked "better" than D3D's due to seeming to not have this problem; unfortunately, OpenGL's Anisotropy specification only gives GL_LINEAR based filtering modes defined behavior, with only the mipmap setting being required to be considered. Some OpenGL implementations were implicitly disabling Anisotropy when the min/mag filters were set to GL_NEAREST, but this behavior is not required by the spec so cannot be relied on.

Add support for framedumping to OpenGL ES.

This is only ever queried, making it a global isn't necessary.

Also remedies places where the video backends and core rely on things
being indirectly included.

D3D: Use a 32-bit floating point depth buffer.