Add support for other colorspaces

[Brankale]

List of all colorspaces to support:

• sRGB
• Display P3
• ITU-R BT.709
• ITU-R BT.2020
• Adobe RGB

[Brankale]

On macOS, the RetroArch framebuffer appears to support only sRGB. Changing the display’s color space profile in the OS settings does not alter color interpretation, which results in washed-out colors when applying LUTs for larger gamuts.