====== Drag and Drop ======

Some objects can be dragged and drop between panels. 

The current list of object that can be dragged out:
  * All explorer items (files, images, shaders, ...)

Current list of Panels that can receive:
  * File explorer: can receive a file reference. It moves the file to the drop location.
  * Text editor: can receive most explorer's item. It add in the text the "new Reference("nameofitem")". Where //Reference// is the proper reference for this type of Object. And "nameofitem" is the name of the Object.