GWTII-164: Porting Feature Info to GWT2 client.

GWTII-164: Added Feature Info widget.
GWTII-164: Added option to zoom to feature object.
GWTII-164: Improved feature info control appearance.
GWTII-164: Refactored Feature Info Control to MVP.
GWTII-164: Using featureclicked handler instead of own map controller.
GWTII-164: Added option to show/hide feature info options.