Moxie Marlinspike 41cad291f9 Display a generated avatar icon rather than a single default.
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

// FREEBIE
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