NEW: Support for themad shapping signals via X85A port

[javimurcia]

Adds support for X85A 4 level power limitation (as implemented by the demand shapping PCB), disussed in https://github.com/raomin/ESPAltherma/discussions/170

It is not possible to enable several output at the same time, even if that is supported by daikin, since the unit will only follow the most restrictive input.

ie: if level 1 limits the power to 5kw and level 2 limits the power to 3kw, and bot inputs are active, the unit will be limited to 3kw, so the level 1 input has no effect)