* Eliminate the use of Picasso.
This gets rid of the single use of the Picasso library (which was causing
the whole library to be imported and shipped) and replaces it with Glide.
TODO: replace this and the other instance(s) of Glide usage with Fresco,
or vice versa.
* Remove dependency on Glide.
This removes the dependency on Glide, as well as the SVG rendering
library, whose only purpose was to display a single SVG image in the
Notification activity. Unfortunately Android doesn't support SVG natively,
but Echo notifications have icons that are SVG formatted. Rather than
import a bunch of heavy libraries to support this single case of SVG
rendering, we can simply create a few local drawables that correspond to
the different types of notifications, and use them instead.
* Remove multidex!
Multidex is a killer of performance and should be avoided at all costs.
* Remove further unused bits.
* Remove final vestige of multidex.
