* Replace hardcoded color values with references to style.xml,
which in turn has different values for light and dark theme.
* Force reload the activity to get the theme applied.
TODO:
* Swap uses it's own theme, need to figure out a way to
handle that. Currently the main Nearby screen which you get
to from the bottom navigation is ok, but anything after
that is light / custom themed.
This makes it a lot easier to setup all the testing stuff. Mostly,
I'm tired of fighting Android Studio's fragility, so I want to remove
as much non-standardness as possible in the hopes of improving that
situation.
closes#534https://gitlab.com/fdroid/fdroidclient/issues/534