Trying again

Okay ditched the fake NPC and figured out how to give this to the
player.  Also added the got_water = true line to prevent us going to
examine vehicle.  Problem is now that I've given the hotplate to the
player I can't figure out how to get rid of it afterword.  I tried
u.i.rem but couldn't get it working.  Also still can't figure out how to
set the values in iuse::hotplate to make it compile.