Now that we have a nice background service, let's put it to work! This
makes update APKs be automatically downloaded after the index is updated.
Then when the user goes to install the updates, they will not have to wait
for the download part.
#601https://gitlab.com/fdroid/fdroidclient/issues/601
Shared element transition for app list item v21 and above
Shared element transitions for API level v21 and above

See merge request !251
* Use a % sign that String.format() recognizes, apparently there are more
than one % signs, in Chinese, its big: %
* a string in lithuanian forgot the %s
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