Fix USB MIDI: use Adafruit TinyUSB Library for proper MIDI support

- Add Adafruit TinyUSB Library dependency
- Create tusb_config.h enabling MIDI class
- USB device named 'Loopy Foot Controller'
- is_connected() check before sending

include/midi_transport.h

@@ -40,4 +40,6 @@ public:
 private:
     std::function<void(const MidiEvent&)> receive_callback;
     bool initialized;
+    
+    void parse_midi_packet(const uint8_t* buffer, uint32_t size, MidiEvent& event);
 };