planner: changed 'Length:' to 'Distance: w/ android 'toast' style background for contrast, increased map path width slightly (from 3 to 5)
Markers: distance impl cleanup
Mission: display distance from previous waypoint in mission list w/ live update while dragging (current and next marker).
Merge pull request #327 from bob01/master_markers_mission

Markers, Mission - distance from prev waypoint in mission planner w/ live update while dragging