change nature of CueBehavior enum to be bitwise

This allows us to OR-in the ImplicitlyIgnoreCues bits, and still toggle
FollowCues on and off to indicate user-requested behavior

libs/ardour/ardour/types.h

@@ -812,9 +812,8 @@ enum LocateTransportDisposition {
 };
 
 enum CueBehavior {
-	FollowCues,
-	ImplicitlyIgnoreCues,
-	ExplicitlyIgnoreCues
+	FollowCues = 0x1,
+	ImplicitlyIgnoreCues = 0x2
 };
 
 typedef std::vector<CaptureInfo*> CaptureInfos;

libs/ardour/enums.cc

@@ -880,8 +880,7 @@ setup_enum_writer ()
 
 	REGISTER_ENUM (FollowCues);
 	REGISTER_ENUM (ImplicitlyIgnoreCues);
-	REGISTER_ENUM (ExplicitlyIgnoreCues);
-	REGISTER (_CueBehavior);
+	REGISTER_BITS (_CueBehavior);
 }
 
 } /* namespace ARDOUR */

libs/ardour/session_process.cc

@@ -1636,7 +1636,7 @@ Session::first_cue_within (samplepos_t s, samplepos_t e)
 		return active_cue;
 	}
 
-	if (Config->get_cue_behavior() != FollowCues) {
+	if (!(Config->get_cue_behavior() & FollowCues)) {
 		return -1;
 	}