Addressing some of Charon's concerns

Changed the text color on the new buttons to be consistent with the
previous buttons.  Added text to the map marker popups to explicate
that you can tap on it to get a direction path (can't modify the marker
window to look more like a button.)  I added the property to make cells
blue when you click on them, but this looked a little odd since we're
using colors as signifiers.  I instead decided to go with gray, which
isn't a color we're using.  I then made the path wider (5, instead of
2) but since the path rendering is zoom-independent, it may still look
a little odd.