[REVIEW ONLY] SVG Code Hints

This is a follow up of #10084, adds Code Hints for SVG.

CC: @redmunds
We should try to align this with [ColorUtils.js](https://github.com/adobe/brackets/blob/master/src/utils/ColorUtils.js).
Unfortunately, we only have a comprehensive regexp right now, including rgb, hex, ...

You should at least include `rebeccapurple`.