The null-check was wrong and checked whether the network is null, not whether it is non-null. This caused dhcp dns servers not to be intercepted and bypass handles not to be created

Currently translated at 96.4% (27 of 28 strings)

Translation: Nebulo/General strings
Translate-URL: https://weblate.frostnerd.com/projects/nebulo/nebulo/nl/

Currently translated at 96.4% (27 of 28 strings)

Translation: Nebulo/General strings
Translate-URL: https://weblate.frostnerd.com/projects/nebulo/nebulo/nl/

Networks in ConnectivityManager.allNetworks apparently can be null (see https://sentry.frostnerd.com/sentry/nebulo/issues/34)

Implements #77

The crash doesn't have to be logged here (customUncaughtExceptionHandler in SmokeScreen already does it)

Implements #69

Implements #67

When disabling the "keep dns cache" feature when the VPN is not running, and then enabling it when it already is running won't clear the table of cached responses but the app is going to try to persist the current cache. If an entry of the current cache was already in the database the app crashed with a failing constraint. As a fix, clear the database before inserting the current cache.

Fixes #63

Resolve the addresses if the network changes (it could have changed from an IPv6-only to an IPv4-only network)

Implements #52

Implements #53