Add color-gamut and any-pointer support

[Finesse]

In contrast to other media features, color-gamut and any-pointer can match multiple values at the same time. For example, if the user display supports DCI-P3, the following expressions will match:

• (color-gamut: p3)
• (color-gamut: srgb) (because DCI-P3 includes sRGB, so if a monitor supports DCI-P3, it does support sRGB)

And the following won't:

• (color-gamut: rec2020)

In order to support this feature, the match function shall either take multiple values for a mocked property or have a built-in knowledge about these features (not applicable to any-pointer).

It will be handy if the library supports arbitrary media features. It will make it future proof (allow to use with forthcoming media features without updating).