Multiple methods not documented

[nebrius]

I noticed that none of the sendOneWire* methods are currently documented. I'm going to try and get around to documenting these soon, but I wanted to get this written down in case I forget/get too busy.

[nebrius]

I also noticed some others that are missing:

• setSamplingInterval
• stepperConfig
• stepperStep

[nebrius]

I also noticed that the UNKNOWN Mode type, equal to 99, is not documented

[nebrius]

There's also all of the accelStepper* and multiStepper* methods missing

[nebrius]

There's also the STEPPER Mode type, equal to 5 (I think)