1. Switch from 300 to 500 colors.
2. Colorize incoming conversation bubbles.
3. Colorize recipeint preference activity toolbar.
4. Support inverted colors in avatars.
5. Make status bar icons tint according to secondary color.
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If the contact doesn't have an image, render a color-coded
background and the first letter of the contact's name.
1) Don't display anything during recipient resolution.
2) Display a # icon in material gray for recipients with no name.
3) Display a material group icon in material gray for groups with
no avatar icon set.
Closes#3104
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