Updates for focus in panels
signal updates
Fixed button clicked function
Updates observer for action_bar(Still incomplete)
Methods to obtain origin and target paths
Implement copy function between panels
Fix folders copyproblem
Fixed typo in panel_manager method
Implemented move method for panels
Fixed indentation problems
Implemented delete method and confirmation modal
Added shortcuts for action bar
removed warnings from panel manager(not used)
Fixed problem with unselected items
Fixed path ending problem
Minor updates
Code Review corrections
Merge pull request #16 from lisandro-montano/feature-copy-item

Feature copy item, move item and delete item