GWTII-164: Porting Feature Info to GWT2 client.

GWTII-164: Added Feature Info widget.
GWTII-164: Re-added inheritance on corewidget.
GWTII-164: Added option to zoom to feature object.
GWTII-164: Fixed feature being selected multiple times.
GWTII-164: Improved feature info control appearance.
GWTII-164: Added i18n to feature info and small general improvements.
GWTII-164: Refactored Feature Info Control to MVP.
GWTII-164: Moved feature selection out of feature widget.
GWTII-164: Renamed FeatureInfo to FeatureInfoWidget with its own factories.
GWTII-164: Moved Feature Info widget to its own package.
GWTII-164: Fixed FeatureInfo main singleton and renamed no-style resource.
GWTII-164: Fixed FeatureInfo resource.
GWTII-164: Fixed FeatureInfo client bundle factory.
GWTII-164: Added some css to Feature Info.
GWTII-164: Did i18n for Feature Info properly.
GWTII-164: Added proper attribute widget builders.
GWTII-164: Added Feature Info to the API.
GWTII-164: Fixed i18n for the Feature Info.
GWTII-164: Removed some featureinfo functionality, the factories and improved view.
GWTII-164: Replaced AttributeWidgetFactory constructor with deferred binding.
GWTII-164: Using featureclicked handler instead of own map controller.
GWTII-164: Added option to show/hide feature info options.
GWTII-164: Improved feature info sample and fixed placement of attributes.
GWTII-164: Improved feature attribute builder system.
GWTII-164: Added own attribute widget factory example.
GWTII-164: Format and javadoc of Feature Info sample.
GWTII-164: Format and javadoc of Feature Info widget.
GWTII-164: Format and javadoc of Feature Info widget in core widget factories.
GWTII-164: Updated Feature Info showcase messages.
GWTII-164: Updated Feature Info showcase css.