Give IRmacros.h smaller scope to avoid impacting projects using IRremoteESP8266 (#1857)

Most projects use IRremoteESP8266 by including the IRremoteESP8266.h file.
To avoid unexpectedly impacting these projects it is safer to move the include to only where it is to be used.

Ref #1853
Ref #1851

Author: tonhuisman

src/IRremoteESP8266.h

@@ -52,8 +52,6 @@
 #include <string>
 #endif  // UNIT_TEST
 
-#include "IRmacros.h"
-
 // Library Version Information
 // Major version number (X.x.x)
 #define _IRREMOTEESP8266_VERSION_MAJOR 2

src/IRtext.cpp

@@ -11,6 +11,8 @@
 #include "IRremoteESP8266.h"
 #include "i18n.h"
 
+#include "IRmacros.h"
+
 #ifndef PROGMEM
 #define PROGMEM  // Pretend we have the PROGMEM macro even if we really don't.
 #endif