Functional notation: rgb[a](R G B[ / A])
CSS Colors Level 4 adds support for space-separated values in the functional notation.
See https://www.w3.org/TR/css-color-4/#rgb-functions
Co-authored-by: Nathan Walker <walkerrunpdx@gmail.com>
original pr credit to @farfromrefug
https://github.com/NativeScript/NativeScript/pull/8519
BREAKING CHANGE
Long standing inconsistency with color handling here.
BEFORE:
```
// #aarrggbb
const color = new Color('#ff00ff00');
Label {
background-color: #ff00ff00;
}
```
AFTER:
```
// #rrggbbaa
const color = new Color('#00ff00ff');
Label {
background-color: #00ff00ff;
}
```
