* automatically trim or delete cache when storage space is low

* improved performance on low memory devices

* make all downloads respect "Only on Wi-Fi" preference

* reduce memory usage when device is running low

* add custom mirrors to any repo by clicking links, scanning QR codes, etc

* improved automatic mirror selection

* lots of swap/nearby bug fixes and improvements

* fix one cause of reoccuring update notifications (#1271)

* make F-Droid recognize fdroid nightly URLs from GitLab