Fixed filament PID loop

Updated defaults for filament PID and others.  Fixed anti-windup on PID
loop.  Added Smith predictor code (commented out since too complex to
tune).  Allow fan output D8 to control winder motor.  Clean up some
menus to simplify (don't need anything related to X,Y,Z axis)
Tuned filament PID.  Added Extruder variables to the EEPROM save/load.
Added D9 for filament cooling fan control.  Cleaned up winder motor
output and menus.    Cleaned up some unused code.