Android support for getting network addresses and interfaces (#1056)

* Replace unsupported network functions for android

* Refactor default/android net addresses processing

* Add default connection values, Refactor netenv

* Fix compilation error

* Combine network change default/android functions

netenv/os_android.go

@@ -0,0 +1,23 @@
+package netenv
+
+import (
+	"github.com/safing/portmaster-android/go/app_interface"
+	"net"
+)
+
+func osGetInterfaceAddrs() ([]net.Addr, error) {
+	list, err := app_interface.GetNetworkAddresses()
+	if err != nil {
+		return nil, err
+	}
+	var netList []net.Addr
+	for _, addr := range list {
+		netList = append(netList, addr.ToIPNet())
+	}
+
+	return netList, nil
+}
+
+func osGetNetworkInterfaces() ([]app_interface.NetworkInterface, error) {
+	return app_interface.GetNetworkInterfaces()
+}