When user grabs an icon, he should see colored areas where he can drop it

Before starting this task, NXP-8683 should be resolved.

On content views, you can grab a document icon and drop it in the clipboard or in the tree. But the available areas where you can drop it are not displayed.

Areas to highlight (see screenshot):

• clibpboard / worklist (depending of which one is displayed)
• tree folders with their names