PRG32 firmware v1.8.0

Resident PRG32 firmware v1.8.0 for the ESP32-C6, built by GitHub Actions with ESP-IDF v5.4.1 from b1345cd.

Pin profiles: breadboard1, breadboard2, pcb1. Each profile has three flash parts (bootloader, partition table, application); Wi-Fi settings, cartridges, and scores on the board are kept.

Flash it without ESP-IDF or the PRG32 SDK:

python3 prg32_flash_release.py --release v1.8.0

(tools/prg32_flash_release.py in this repository). Format and checksums: docs/usage/firmware_releases.md, SHA256SUMS.