Stunner - Client side export features.

The goal for this task is having some buttons on client side, which allow:

• Export canvas (diagram) to image (JPG/PNG)
• Export canvas (diagram) to PDF

The export operation will result in a file download. No server side interactions must be performed for these operations, all work have to be done on client side.

This task implies:

• Researching and testing fir some opensource javascript libraries to achieve the goals.
• Wrappers
  • Research and integration of some GWT wrappers for the libraries above. Consider too if make sense creating the gwt wrappers from our side.
  • Consider adding these on some common kie/uf module - this way it can be used as wekk on other widgets,editors,etc
• Ensure features working on all support browsers
• Stunner
  • Integrate the gwt wrappers
  • Create toolbar buttons & commands (logic(operations) for the export goals (standalone & project showcases)
• Unit testing