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/driver/rcinput.h

@@ -52,6 +52,8 @@
 #endif
 #endif
 
+#include <driver/neutrino_msg_t.h>
+
 #ifndef KEY_OK
 #define KEY_OK           0x160
 #endif
@@ -117,13 +119,6 @@
 	#define KEY_FN_B
 */
 
-
-typedef unsigned long neutrino_msg_t;
-typedef unsigned long neutrino_msg_data_t;
-
-#define NEUTRINO_UDS_NAME "/tmp/neutrino.sock"
-
-
 class CRCInput
 {
 	private:
@@ -275,7 +270,7 @@ class CRCInput
 			RC_zoomout	= KEY_ZOOMOUT,
 
 			RC_timeout	= 0xFFFFFFFF,
-			RC_nokey	= 0xFFFFFFFE
+			RC_nokey	= RC_NOKEY
 		};
 
 		//rc-hardware definitions