Prior to this commit, communities without an image would render invisible
in the navigation bar of the application. To avoid this, we're now falling
back to our StatusLetterIdenticon component, which renders the first letter
of the community name with the color of the community.
When the `StatusLetterIdenticon` received a `#channel` name that starts
with `#`, it wouldn't properly determine the channel color because of
not stripping out the `#`.
This component introduces `StatusLetterIdenticon`, `StatusImageIdenticon`
and `StatusIdenticon`.
- `StatusLetterIdenticon` renders an identicon with a single letter based on a
name.
- `StatusImageIdenticon` renders an actual image based on an identicon URL
- `StatusIdenticon` is a composition of the former both, but with a loading mechanism
to decide which should be rendered
The commit also ensures all of these components are used respectively throughout
the application.