Introduce a "debug to serial" method about rflink32 HOT 1 CLOSED

Obviously, if SerialDebug is declared inside the #ifndef INCLUDE_UTIL_H_ section from 7_Utils.h, it will not be possible to control its activation on a plugin by plugin basis.
This is because all the C files for each plugins are hard included in the main 5_Plugin.cpp file, which in and of itself is an issue that would be worth looking at.

That being said, it is possible to allow a per plugin control, by moving the above macro definitions out of the #ifndef INCLUDE_UTIL_H_ section while adding a #undef declaration at the end of the block, like so:

#ifdef SerialDebugActivated
#define SerialDebug(method, arguments...)  Serial.method(arguments)
#else
#define SerialDebug(method, arguments...)  /**/
#endif
#define SerialDebugPrintln(arguments...)   SerialDebug(println, arguments)
#define SerialDebugPrint(arguments...)     SerialDebug(print, arguments)
#undef SerialDebugActivated

This way, every plugin that includes 7_Utils.h gets a chance to set SerialDebugActivated for itself, effectively giving control on a per plugin basis.

However, this emits a warning: "SerialDebug" redefined
This is fixed by undefining it before redefining it, which gives the final following block:

#ifdef SerialDebugActivated
#undef SerialDebug
#define SerialDebug(method, arguments...)  Serial.method(arguments)
#else
#undef SerialDebug
#define SerialDebug(method, arguments...)  /**/
#endif
#define SerialDebugPrintln(arguments...)   SerialDebug(println, arguments)
#define SerialDebugPrint(arguments...)     SerialDebug(print, arguments)
#undef SerialDebugActivated

Obviously, there would be an explanation comment in front of that block in the pull request.

from rflink32.