Markers: added detail text + translucent background for contrast
Markers: lighter background
Markers: wip - separated MarkerWithText.getMarkerWithText(…) into MarkerWithText.getMarkerWithText(…) + MarkerWithText.getMarkerWithTextWithDetail(…)
Markers: multi-colour markers w/ text & detail where appropriate. All markers generated from ic_marker_white.
Waypoints: exclude waypoints (incl. home) from .'getAllVisibleCoordinates()' if coords not initialized e.g. (0, 0). At x and/or y must be non-zero for inclusion.
Zoom: Increase padding around bounded coords to prevent markers being positioned off-screen
Markers: display and update info window with waypoint #, command and distance from previous waypoint on flight path (if applicable)
Merge pull request #324 from bob01/master_markers

Markers - additional UI + zooming fixes, distance while dragging marker