Revised Icons and Coded them In

  -Removed the Previous Symbolic Icons and added new Wrench Symbolic
Icon in Desktop/.../actions/ folder
  -Added "icon_name" perameter in def buttonless_button in
gui/widget.py
  -Coded the Symbolic icons in gui/workspace.py
  -Added Wrench Icon under Actions
  -Moved Rejected Symbolic Icons on the outside of
svg/symbolic-icons.svgz