mapbox: fire plotly_relayout only when 'movend' is triggered by mouse
mapbox: fire plotly_relayout only when 'movend' is triggered by mouse

- 'moveend' (and 'movestart', 'move') gets triggered
   by map.setCenter, map.setZoom, map.setBearing and map.setPitch.
- make sure that 'plotly_relayout' is triggered here only
  when the 'moveend' originates from a mouse target.

plotly/plotly.js,iongroup/plotly.js,aburato/plotly.js,asolagmbh/plotly.js,aburato/plotly.js,iongroup/plotly.js,plotly/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,etpinard/plotly.js,iongroup/plotly.js,etpinard/plotly.js,etpinard/plotly.js,plotly/plotly.js,asolagmbh/plotly.js