Ramses-III + ramses_rf

[silverailscolo]

To align this library with the folks analysing the new Ramses-III (R3) messages and preparing the ramses_esp firmware to pass them in, feel free to list your interface principles below.

For background on R3 for EU: see #332 (comment)

Since Nov. 2025, ramses_esp will insert a unique flag * at position (3?) in any message recognized as R3.

Work on decrypting R3 traffic is ongoing, and we hope to keep Ramses RF aligned from the start.