Ir esp8266 lib update and code impacts (#235)

* integrate new IRremoteESP8266 lib 2.4.2 and add new protocols

IR_RC6
IR_MITSUBISHI
IR_GICABLE
IR_MITSUBISHI2
IR_LASERTAG
IR_CARRIER_AC
IR_MIDEA
IR_NIKAI
IR_SHERWOOD
IR_DENON
IR_AIWA_RC_T501
IR_JVC

lib/IRremoteESP8266/src/IRtimer.h

@@ -12,6 +12,9 @@ class IRtimer {
   IRtimer();
   void reset();
   uint32_t elapsed();
+#ifdef UNIT_TEST
+  static void add(uint32_t usecs);
+#endif  // UNIT_TEST
 
  private:
   uint32_t start;