TreeDataMove

Implement copy and move for tree like components.

Methods
copy makes a copy of an item
move moves an item to a new position
moveBottom moves the specified item to the last position
moveDown moves an element downwards within its current branch
moveTop moves the specified item to the first position
moveUp moves an element upwards within its current branch
Other
$dropAllow can be redefined, if you need custom drop rules
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