publish libraries to avoid users to have to download them one by one

lib/IRremoteESP8266/src/IRtimer.cpp

@@ -0,0 +1,33 @@
+// Copyright 2017 David Conran
+
+#include "IRtimer.h"
+#ifndef UNIT_TEST
+#include <Arduino.h>
+#endif
+
+// This class performs a simple time in useconds since instantiated.
+// Handles when the system timer wraps around (once).
+
+IRtimer::IRtimer() {
+  reset();
+}
+
+void IRtimer::reset() {
+#ifndef UNIT_TEST
+  start = micros();
+#else
+  start = 0;
+#endif
+}
+
+uint32_t IRtimer::elapsed() {
+#ifndef UNIT_TEST
+  uint32_t now = micros();
+#else
+  uint32_t now = 0;
+#endif
+  if (start <= now)  // Check if the system timer has wrapped.
+    return now - start;  // No wrap.
+  else
+    return UINT32_MAX - start + now;  // Has wrapped.
+}