Extend RouteProcessorChange Types to be more specific about name changes

This is in preparation for I/O Plugins to update port names,
which should not happen every time some unrelated property changes

libs/ardour/ardour/types.h

@@ -753,12 +753,14 @@ enum AppleNSGLViewMode {
  */
 struct RouteProcessorChange {
 	enum Type {
-		NoProcessorChange = 0x0,
-		MeterPointChange  = 0x1,
-		RealTimeChange    = 0x2,
-		GeneralChange     = 0x4,
-		SendReturnChange  = 0x8,
-		CustomPinChange   = 0x10
+		NoProcessorChange   = 0x00,
+		MeterPointChange    = 0x01,
+		RealTimeChange      = 0x02,
+		GeneralChange       = 0x04,
+		SendReturnChange    = 0x08,
+		CustomPinChange     = 0x10,
+		ParameterNameChange = 0x20,
+		PortNameChange      = 0x40
 	};
 
 	RouteProcessorChange () : type (GeneralChange), meter_visibly_changed (true)

libs/ardour/vst3_plugin.cc

@@ -1626,6 +1626,7 @@ VST3PI::restartComponent (int32 flags)
 				}
 			}
 		}
+		send_processors_changed (RouteProcessorChange (RouteProcessorChange::PortNameChange, false)); /* EMIT SIGNAL */
 	}
 	if (flags & Vst::kParamTitlesChanged) {
 		/* titles or default values or flags have changed */
@@ -1647,7 +1648,7 @@ VST3PI::restartComponent (int32 flags)
 				p.normal = pi.defaultNormalizedValue;
 			}
 		}
-		send_processors_changed (RouteProcessorChange ()); /* EMIT SIGNAL */
+		send_processors_changed (RouteProcessorChange (RouteProcessorChange::ParameterNameChange, false)); /* EMIT SIGNAL */
 	}
 	if (flags & Vst::kIoChanged) {
 		warning << "VST3: Vst::kIoChanged (not implemented)" << endmsg;