AsyncTask is deprecated, use other stuff, e.g. coroutines

[UweTrottmann]

This is an ongoing effort. Nothing is wrong with current code using AsyncTask, new code shouldn't use it. If significantly changing old code, try to migrate away.

Migrate to coroutines if possible, maybe similar to 74bdb6af

• Parts in #752

https://developer.android.com/kotlin/coroutines-adv https://developer.android.com/topic/libraries/architecture/coroutines