JobIntentService revamp

JobIntentService is a nice replacement for IntentService that works better with the Android 8.0+ background restrictions, and provides more reliable operation on other Android versions since it handle setting and releasing a wake lock while the service is running. Without this, it is likely that UpdateService would be often killed on Android 8.0+

It is WIP since it is based on !677 (merged)

This also includes a number of bug fixes related to ACRA crashes, and makes the Anti-Features list in App Details clickable.

@strcat this should help on CopperheadOS quite a bit.