[WIP] fix(css): update mask-repeat and mask-position according to spec

[sigveio]

This pull request aims to update the initial value of mask-repeat and mask-position to be in line with the current spec.

Specs:
https://drafts.fxtf.org/css-masking/#the-mask-repeat
https://drafts.fxtf.org/css-masking/#the-mask-position

Additional context:
w3c/csswg-drafts/issues/599
w3c/fxtf-drafts/issues/111

[sigveio]

Going over the spec for this again, I noticed that some of the other JSON properties for these two could also use updating. So I'm marking it as a WIP for now.

This is the definition of appliesto in the latest spec for these elements:

All elements. In SVG, it applies to container elements excluding the defs element, all graphics elements and the use element

Which deviates from the allElementsSVGContainerElements used in the JSON currently.

What would be a suitable replacement?

Attempting to break it down:

All elements. -> allElements
In SVG, it applies to container elements -> SVGContainerElements
excluding the defs element, all graphics elements and the use element -> ExcludingDefsGraphicsAndUse

Result:

allElementsSVGContainerElementsExcludingDefsGraphicsAndUse

or (perhaps slightly clearer)

allElementsAndSVGContainerElementsExcludingDefsGraphicsAndUse

Thoughts?

Excluding (more in line with text in spec) or Except (more in line with existing schema entries)?