* companion: optional double ACKs, new prefs.multi_acks

examples/companion_radio/MyMesh.h

@@ -97,6 +97,7 @@ protected:
   float getAirtimeBudgetFactor() const override;
   int getInterferenceThreshold() const override;
   int calcRxDelay(float score, uint32_t air_time) const override;
+  uint8_t getExtraAckTransmitCount() const override;
 
   void logRxRaw(float snr, float rssi, const uint8_t raw[], int len) override;
   bool isAutoAddEnabled() const override;