VPN Hotspot 2.0: Client+ (#39)

Fix #13, #38. I don't have a lot of confidence that this would work very well for every device.

Also here's an SQL command that hopefully somebody could make into the app for me: `SELECT TrafficRecord.mac, SUM(TrafficRecord.sentPackets), SUM(TrafficRecord.sentBytes), SUM(TrafficRecord.receivedPackets), SUM(TrafficRecord.receivedBytes) FROM TrafficRecord LEFT JOIN TrafficRecord AS Next ON TrafficRecord.id = Next.previousId WHERE Next.id IS NULL GROUP BY TrafficRecord.mac;`

mobile/src/main/java/be/mygod/vpnhotspot/RepeaterService.kt

@@ -238,7 +238,7 @@ class RepeaterService : Service(), WifiP2pManager.ChannelListener, SharedPrefere
     private fun doStart(group: WifiP2pGroup) {
         this.group = group
         check(routingManager == null)
-        routingManager = LocalOnlyInterfaceManager(group.`interface`!!)
+        routingManager = LocalOnlyInterfaceManager(this, group.`interface`!!)
         status = Status.ACTIVE
         showNotification(group)
     }