Enable Lv2 Atom ports

All Atom ports are now being created and connected. Currently only MIDI
input ports are supplied with data.

Major contribution to #562 ("lv2 support").

plugins/Lv2Effect/Lv2Effect.cpp

@@ -74,6 +74,7 @@ bool Lv2Effect::processAudioBuffer(sampleFrame *buf, const fpp_t frames)
 	m_controls.run(frames);
 //	m_pluginMutex.unlock();
 
+	m_controls.copyModelsToLmms();
 	m_controls.copyBuffersToLmms(m_tmpOutputSmps.data(), frames);
 
 	double outSum = .0;

plugins/Lv2Instrument/Lv2Instrument.cpp

@@ -131,11 +131,9 @@ void Lv2Instrument::loadFile(const QString &file)
 bool Lv2Instrument::handleMidiEvent(
 	const MidiEvent &event, const MidiTime &time, f_cnt_t offset)
 {
-	// this function can be called from GUI threads while the plugin is running,
-	// so this requires caching, e.g. in ringbuffers
-	(void)time;
-	(void)offset;
-	(void)event;
+	// this function can be called from GUI threads while the plugin is running
+	// handleMidiInputEvent will use a thread-safe ringbuffer
+	handleMidiInputEvent(event, time, offset);
 	return true;
 }
 #endif
@@ -161,6 +159,7 @@ void Lv2Instrument::play(sampleFrame *buf)
 
 	run(fpp);
 
+	copyModelsToLmms();
 	copyBuffersToLmms(buf, fpp);
 
 	instrumentTrack()->processAudioBuffer(buf, fpp, nullptr);

plugins/Lv2Instrument/Lv2Instrument.h

@@ -63,7 +63,7 @@ public:
 	/*
 		realtime funcs
 	*/
-	bool hasNoteInput() const override { return false; /* not supported yet */ }
+	bool hasNoteInput() const override { return Lv2ControlBase::hasNoteInput(); }
 #ifdef LV2_INSTRUMENT_USE_MIDI
 	bool handleMidiEvent(const MidiEvent &event,
 		const MidiTime &time = MidiTime(), f_cnt_t offset = 0) override;