feat: ESP32-S3 & RP2040/RP2350 examples + TinyUSB >= 0.16 compat fixes

.gitignore

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+# Build artifacts
+.pio/
+build/
+*.o
+*.a
+*.elf
+*.bin
+*.map
+
+# IDE
+.vscode/
+*.swp
+*~
+
+# Python
+*.pyc
+__pycache__/
+
+# Internal working documents (not for upstream)
+tusb_ump_esp32s3_handoff.md
+tusb_ump_rp2040_handoff.md
+*_handoff.md
+CHANGES.md
+CHANGES_pt-BR.md

examples/T-Display-S3-ESP32-S3-MIDI2-PingPong/arduino/tdisplay_s3_midi2/README.md

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+# USB MIDI 2.0 Device — Arduino IDE
+
+ESP32-S3 USB MIDI 2.0 device example using tusb_ump.
+Tested on LilyGO T-Display-S3.
+
+## Setup
+
+1. **Board:** ESP32S3 Dev Module
+2. **Tools > USB Mode:** USB-OTG (TinyUSB)
+3. **Tools > USB CDC On Boot:** Disabled
+4. **LovyanGFX:** install via Library Manager
+5. **tusb_ump:** copy repo into `~/Arduino/libraries/tusb_ump/`
+6. **Build flags:** copy `platform.local.txt.example` as `platform.local.txt` to:
+   - Linux: `~/.arduino15/packages/esp32/hardware/esp32/<version>/`
+   - macOS: `~/Library/Arduino15/packages/esp32/hardware/esp32/<version>/`
+   - Windows: `%LOCALAPPDATA%\Arduino15\packages\esp32\hardware\esp32\<version>\`
+7. **Restart Arduino IDE**, then open `tdisplay_s3_midi2.ino` and upload.
+
+## Files
+
+| File | Description |
+|------|-------------|
+| `tdisplay_s3_midi2.ino` | Main sketch (setup/loop, buttons, UMP RX/TX) |
+| `usb_descriptors.cpp` | USB MIDI 2.0 config descriptor (dual alt settings) |
+| `UMPDisplay.h` | LovyanGFX display handler |
+| `mapping.h` | Pin assignments, colours, layout |
+| `platform.local.txt.example` | Build flags template for Arduino IDE |
+
+## Controls
+
+| Button | Action |
+|--------|--------|
+| BTN1 (GPIO0) | Toggle NoteOn / NoteOff (C5) |
+| BTN2 (GPIO14) | Cycle velocity: 32 > 64 > 96 > 127 |
+
+See the [PlatformIO version](../../platformio/tdisplay_s3_midi2/) for an
+alternative build setup that doesn't require `platform.local.txt`.