Adjust code to use private control method

AirLoopHVACUnitarySystem::controlMethod is now private and only
available in the impl.  This translator has been updated to use that
private method.

[#73802200]
Add support for WLHP coil on AirSys

This puts heat pump coils (heating and cooling) in their own
AirLoopHVACUnitarySystem objects.

[#73802200]