fix const char warnings

Author: Richard Unger

src/communication/Commander.cpp

@@ -11,10 +11,10 @@ Commander::Commander(char eol, bool echo){
 }
 
 
-void Commander::add(char id, CommandCallback onCommand, char* label ){
+void Commander::add(char id, CommandCallback onCommand, const char* label ){
   call_list[call_count] = onCommand;
   call_ids[call_count] = id;
-  call_label[call_count] = label;
+  call_label[call_count] = (char*)label;
   call_count++;
 }
 

src/communication/Commander.h

@@ -91,7 +91,7 @@ class Commander
      * @param onCommand  - function pointer void function(char*)
      * @param label      - string label to be displayed when scan command sent
      */
-    void add(char id , CommandCallback onCommand, char* label = nullptr);
+    void add(char id , CommandCallback onCommand, const char* label = nullptr);
 
     // printing variables
     VerboseMode verbose = VerboseMode::user_friendly; //!< flag signaling that the commands should output user understanable text