Add SVG2 geometry properties as valid CSS

[runningskull]

Added properties:

• cx
• cy
• r
• rx
• ry
• width
• height

Removed comment about possible deprecation of x and y properties.

Per https://www.w3.org/TR/SVG2/styling.html#PresentationAttributes
(more detail at https://www.w3.org/TR/2015/WD-SVG2-20150915/geometry.html)

I may have messed up the formatting of the newlines inside the string - couldn't figure out exactly what the rule was.

Cheers & thanks for making vscode! ✨

[aeschli]

Please see the file header:

	"information_for_contributors": [
		"This file has been converted from https://github.com/atom/language-css/blob/master/grammars/css.cson",
		"If you want to provide a fix or improvement, please create a pull request against the original repository.",
		"Once accepted there, we are happy to receive an update request."
	],