Upgrade to coil 2.0.0 and completely refactor the usage of coil to work
with the new library structure. This also fixes the issue where error
icons will just re-appear due to blocking calls. I had to add a fix on
my end and also use the new caching system in coil 2.0.0.
Actually bother to add license boilerplate. Even though I've written
the entirety of Auxio, the boilerplate will be under "Auxio Project"
instead, as I don't want to share my real name.
