v1.2.4

• Add a feature for building a marker with Font Awesome icon
• Use sticky popovers on WireCloud 1.4
• Popover events are disabled while moving/zooming the map (when using sticky
  events).
• Repaint popovers when moving/zooming the map (when using sticky events).
• Fix placement of popovers when icon anchor is different to [0.5, 1]
• Switch code to use let and const
• Update popover contents when the selected PoI is updated
• Allow to pass a list of feature ids to the poiInputCenter endpoint