Enyo 2151

NB: related "package.js" files are not updated yet

* ENYO-2151: 
- Files & folders drag'n'drop with mouse cursor which indicates if it's possible or not to perform the action 
- copy & rename commands for the file system have been updated to use more parameters than name only... 
NB: the update of old and new related 'package.js' do not work...
* ENYO-2151: attempts to catch well events
* ENYO-2151: draggable ok for AresNodes attempts to use events inside AresNode and HermesFileTree... but same trouble: dragfinish and/or drop event not well catch. investigation in progress
* ENYO-2151: 
- events usage attempts: 
-- in HermesFileTree first but moved in AresNode 
-- kept in HermesFileTree just for information (will be wiped) 
- use of draggable attribute for AresNode: provide a transparent snapshot of the collection of nodes to be moved

Enyo-DCO-1.1-Signed-off-by: Vincent Herilier <vincent.herilier@hp.com>