ol-ext: Copy/paste interaction

The ol/interaction/CopyPaste is an interaction to copy/paste features on a map.

The example uses a ol/ineraction/FocusMap to focus on the map when clicked to ensure the key events are avaliable.

Look at this example to copy features beetween maps.
Click on feature to select / transform it.
Use Shift to select many features.
Use Ctrl+C, Ctrl+X, Ctrl+V to copy paste selected features.