Updated solarized light and dark color schemes

I have 'tweaked' the color assignments for both solarized light and dark themes.

* Primarily this brings the color assignments to match those of @neilpa's [cmd-colors-solarized](https://github.com/neilpa/cmd-colors-solarized) repo.
* Both dark & light schemes have identical color palettes with only a inverted `ScreenColors` and `PopupColors`
* Before and After pics attached below