DCC SOUNDCENTER 2.0
===================

Official 2.0 release based on the tested v1.1.6 prototype.

Main features:
- ESP32 based DCC controlled MP3 sound system
- DCC input on GPIO27 via 6N137
- Web based MP3 library, upload and playlists
- Permanent MP3 IDs and playlist references
- Metadata, search and sortable tables
- Play/Stop toggle directly from the library
- OLED status pages for network, playback and SD card
- SD card capacity, used/free space and file counts
- Three status LEDs: green WiFi, yellow DCC, blue Play
- Compact dark/gold DCC SOUNDCENTER logo
- OTA firmware update through ProjectUNION

Important:
- Keep partitions.csv in the same folder as the .ino file.
- If Arduino IDE reports a 1,310,720 byte maximum, choose a larger
  OTA-capable partition scheme under Tools > Partition Scheme.
- First upload after changing partition layout should be made by USB.

Hardware status LEDs:
- Green: WiFi connected
- Yellow: DCC signal / command activity
- Blue: MP3 playback active
