fix: DEBUG macro definition for ESP32

Refactor to IR_DEBUG since DEBUG is too generic and might interfere with other definitions.

Author: zehnm

src/IRrecv.cpp

@@ -368,12 +368,12 @@ void IRrecv::enableIRIn(const bool pullup) {
   // Initialise the ESP32 timer.
   // 80MHz / 80 = 1 uSec granularity.
   timer = timerBegin(_timer_num, 80, true);
-#ifdef DEBUG
+#ifdef IR_DEBUG
   if (timer == NULL) {
     DPRINT("FATAL: Unable enable system timer: ");
     DPRINTLN((uint16_t)_timer_num);
   }
-#endif  // DEBUG
+#endif  // IR_DEBUG
   assert(timer != NULL);  // Check we actually got the timer.
   // Set the timer so it only fires once, and set it's trigger in uSeconds.
   timerAlarmWrite(timer, MS_TO_USEC(params.timeout), ONCE);

src/IRremoteESP8266.h

@@ -1503,9 +1503,9 @@ const uint16_t kYorkStateLength = 17;
 #define WHYNTER_BITS                  kWhynterBits
 
 // Turn on Debugging information by uncommenting the following line.
-// #define DEBUG 1
+// #define IR_DEBUG 1
 
-#ifdef DEBUG
+#ifdef IR_DEBUG
 #ifdef UNIT_TEST
 #define DPRINT(x) do { \
     std::cout << x; \
@@ -1525,18 +1525,18 @@ const uint16_t kYorkStateLength = 17;
   Serial.println(x); \
   } \
   while (0)
-#endif  // ARDUINO
 #elif defined(ESP32)
 #define DPRINT(x) do { \
     std::cout << x; \
   } while (0)
 #define DPRINTLN(x) do { \
     std::cout << x << std::endl; \
   } while (0)
-#else  // DEBUG
+#endif  // ARDUINO
+#else  // IR_DEBUG
 #define DPRINT(x)
 #define DPRINTLN(x)
-#endif  // DEBUG
+#endif  // IR_DEBUG
 
 #ifdef UNIT_TEST
 #ifndef F