Improve audio and midi support.

src/audio/midi/MidiTrack.cpp

@@ -1,11 +1,35 @@
 #include "MidiTrack.h"
 
+#include "MidiEvent.h"
+
 MidiTrack::MidiTrack()
 {
 
 }
 
-void MidiTrack::AddEvent(const MidiEvent& event)
+MidiTrack::~MidiTrack()
 {
-	mEvents.push_back(event);
+
+}
+
+void MidiTrack::AddEvent(MidiEventPtr event)
+{
+    mEvents.push_back(std::move(event));
+}
+
+MidiEvent* MidiTrack::GetEvent(std::size_t idx) const
+{
+    return mEvents[idx].get();
+}
+
+std::size_t MidiTrack::GetNumEvents()
+{
+    return mEvents.size();
+}
+
+std::string MidiTrack::Serialize() const
+{
+    std::string output = "MidiTrack\n";
+    output += "Num Events: " + std::to_string(mEvents.size()) + "\n";
+    return output;
 }