reduce dependencies on driver/rcinput.h

* add new header that only contains neutrino_msg_t and friends, often this
  is all that's needed instead of full rcinput.h
* directly include rcinput.h in some cpp files instead of relying on
  accidental inclusion in some header
* add class forward declarations to avoid dragging in rcinput indirectly
This could use more work to further reduce the impact; maybe separating
the CRCinput::key_* constants from the rcinput class would be good.

src/gui/user_menue_setup.cpp

@@ -35,6 +35,7 @@
 #include <config.h>
 #endif
 
+#include <driver/rcinput.h>
 #include "user_menue_setup.h"
 
 #include <global.h>