chore!(amneziawg): refactor to be separate from wireguard

- amneziawg is now a VPN protocol and no longer a Wireguard implementation
- Use it with VPN_TYPE=amneziawg
- document AMNEZIAWG_* options in Dockerfile
- document amneziawg support in readme
- separate amneziawg settings and code from wireguard
- re-use code from wireguard whenever possible

internal/wireguard/log_test.go

@@ -0,0 +1,23 @@
+package wireguard
+
+import (
+	"testing"
+
+	"github.com/golang/mock/gomock"
+)
+
+func Test_makeDeviceLogger(t *testing.T) {
+	t.Parallel()
+
+	ctrl := gomock.NewController(t)
+
+	logger := NewMockLogger(ctrl)
+
+	deviceLogger := makeDeviceLogger(logger)
+
+	logger.EXPECT().Debugf("test %d", 1)
+	deviceLogger.Verbosef("test %d", 1)
+
+	logger.EXPECT().Errorf("test %d", 2)
+	deviceLogger.Errorf("test %d", 2)
+}