Separation of RTD and TC classes confusing

[JHSawatzki]

Both probe types use the same inputs/channels so the current implementation is confusing, espacially when using both types in the same project.

I suggest using a shared class like I did in my fork of the old lib, see https://github.com/JHSawatzki/Arduino_MachineControl/blob/master/src/Arduino_MachineControl.h

I could probably also provide a pull request with an implementation not breaking your current API.

[leonardocavagnis]

Hi @JHSawatzki,
Thanks for the proposal!
I don't completely agree with your point. We moved to separate classes to avoid using the "double dot" notation (temp_probes.rtd.) of the deprecated one.
However, I invite you to propose your solution in a PR, and I'll analyze it. 😊