[dom] Move out of color-base module

Currently, the `dom-style` module depends on `color-base` module only for falling back to calculate computed style on legacy Opera (<= 12), but the latest Opera (15+) is almost the same Chrome (`Y.UA.webkit` returns truth actually). Many core modules are depending the `dom-style` module, I expect that many YUI modules and applications will benefit to faster from more than a little by this change. I also hope that this resolves #1621.

I'd like to push this into the `dev-3.x` branch because this changes are across some module's dependencies. And I will rebuild `anim`, `dom`, `loader`, `graphics` modules and update the `HISTORY.md` for `dom` module when this has been merged.

Note: The `dom-style-ie` module will still depends on the `color-base` module for the legacy IE (<= 8.0).