Bug 1041904 - [Email] Customize Status Bar Color

Updates status bar color based on card color. Cards does most of the work, but some specialized dialogs need to card the Cards.setStatusColor manually. Longer term, I think it is better to refactor those uses to fit into the Cards more. However, I want to do that work after landing the custom element work.

setColor allows a few different options for choosing the color. The main goal is to avoid hard coding specific colors in the HTML or JavaScript, except for the meta tag itself, and setting up a default color.