This allows a designated app to read the install history from F-Droid via a
ContentProvider. The app is designated by the packageName defined in the
string install_history_reader_packageName.
The install and uninstall history has lots of uses, including displaying
to the user in the app itself, reporting to the Device Administrator to
enable tracking of installs/uninstalls from the admin's app repo, etc. It
can also be used as part of a "popularity contest" #396
This schedules CleanCacheService to run regularly, and delete files older
than the value set in the new "Keep cached apps" preference. It auto-
migrates the old "Cache packages" pref to the new one. The default cache
time for people who did not have "Cache packages" enabled is one day.
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
