Make CssRotateValue ect. to public

[garryxiao]

Description

When I tried to get the angle value from CSS definition "transform: rotate(-45deg)". The code expected may be
var transform = css.GetProperty(PropertyNames.Transform); if (transform.RawValue is CssTupleValue<ICssValue> tt) { var rotateItem = tt.Items.FirstOrDefault(item => item is CssRotateValue) as CssRotateValue; }
But the CssRotateValue currently is internal. Maybe I am right, is there any alternative to do that?

Background

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Specification

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