show firmware version and build date on room server screen

examples/simple_room_server/UITask.h

@@ -8,11 +8,12 @@ class UITask {
   int _prevBtnState;
   const char* _node_name;
   const char* _build_date;
+  char _version_info[32];
 
   void renderCurrScreen();
 public:
   UITask(DisplayDriver& display) : _display(&display) { _next_read = _next_refresh = 0; }
-  void begin(const char* node_name, const char* build_date);
+  void begin(const char* node_name, const char* build_date, const char* firmware_version);
 
   void loop();
 };