feat(usb): allow the MIDI constructor to define a device name

This PR will allow the user to modify the MIDI USB Device Name (device descriptor). Fomer API continues to be valid and the default device name is "TinyUSB MIDI". 

The user can change the device name by passing a string to the constructor, declaring it like this `USBMIDI myMIDI("MyDeviceName");

Author: SuGlider

libraries/USB/src/USBMIDI.cpp

@@ -11,14 +11,14 @@
 
 static bool tinyusb_midi_descriptor_loaded = false;
 static bool tinyusb_midi_interface_enabled = false;
+static String deviceDescriptor("");
 
 extern "C" uint16_t tusb_midi_load_descriptor(uint8_t *dst, uint8_t *itf) {
   if (tinyusb_midi_descriptor_loaded) {
     return 0;
   }
   tinyusb_midi_descriptor_loaded = true;
-
-  uint8_t str_index = tinyusb_add_string_descriptor("TinyUSB MIDI");
+  uint8_t str_index = tinyusb_add_string_descriptor(deviceDescriptor.c_str());
   uint8_t ep_in = tinyusb_get_free_in_endpoint();
   TU_VERIFY(ep_in != 0);
   uint8_t ep_out = tinyusb_get_free_out_endpoint();
@@ -32,9 +32,10 @@ extern "C" uint16_t tusb_midi_load_descriptor(uint8_t *dst, uint8_t *itf) {
   return TUD_MIDI_DESC_LEN;
 }
 
-USBMIDI::USBMIDI() {
+USBMIDI::USBMIDI(String devDescName = "TinyUSB MIDI") {
   if (!tinyusb_midi_interface_enabled) {
     tinyusb_midi_interface_enabled = true;
+    deviceDescriptor = devDescName;
     tinyusb_enable_interface(USB_INTERFACE_MIDI, TUD_MIDI_DESC_LEN, tusb_midi_load_descriptor);
   } else {
     log_e("USBMIDI: Multiple instances of USBMIDI not supported!");