man_made=water_tap preset

[tohaklim]

This tag seems to be less popular than drinking_water, however a lot of places would tend to have water taps that serve technical-use/non-drinkable water.
An icon that does not cross over with am=drinking_water might be tricky

[quincylvania]

@tohaklim Thanks for posting. I'm okay with using the same icon for now, though eventually we could use a tap with a knob but no water glass.

I also added a field for drinking_water so mappers can specify potability.