More Ardour/Mixbus codebase unification

Note Presentation-Info bits used by Mixbus to prevent conflicts
when sharing sessions.

libs/ardour/ardour/presentation_info.h

@@ -111,12 +111,19 @@ class LIBARDOUR_API PresentationInfo : public PBD::Stateful
 		MasterOut = 0x20,
 		MonitorOut = 0x40,
 		Auditioner = 0x80,
+#ifdef MIXBUS
+		Mixbus = 0x1000,
+#endif
 		/* These are for sharing Stripable states between the GUI and other
 		 * user interfaces/control surfaces
 		 */
 		Hidden = 0x100,
+#ifdef MIXBUS
+		MixbusEditorHidden = 0x800,
+#endif
 		/* single bit indicates that the group order is set */
 		OrderSet = 0x400,
+
 		/* bus type for monitor mixes */
 		FoldbackBus = 0x2000,
 

libs/ardour/route.cc

@@ -1390,6 +1390,11 @@ Route::is_internal_processor (boost::shared_ptr<Processor> p) const
 	if (p == _amp || p == _meter || p == _main_outs || p == _delayline || p == _trim || p == _polarity) {
 		return true;
 	}
+#ifdef MIXBUS
+	if (p == _ch_pre || p == _ch_post || p == _ch_eq  || p == _ch_comp) {
+		return true;
+	}
+#endif
 	return false;
 }