Moved stream write and stream skip into common

src/TinyGsmClientXBee.h

@@ -729,17 +729,6 @@ public:
      while (stream.available()) { stream.read(); }
    }
 
-  template<typename T>
-  void streamWrite(T last) {
-    stream.print(last);
-  }
-
-  template<typename T, typename... Args>
-  void streamWrite(T head, Args... tail) {
-    stream.print(head);
-    streamWrite(tail...);
-  }
-
   template<typename... Args>
   void sendAT(Args... cmd) {
     streamWrite("AT", cmd..., GSM_NL);