GWTII-163 Refactor map legend widget-> follow widget structure
renamed to MapControlPanel
theme of core widgets deleted
GWTII-163

put control panels in map package
provide javadoc
move legend functionality to example-jar
GWTII-163 fix legend icon url
GWTII-163 show layer opacity as legend for raster layers
GWTII-163: Showcase update.
Merge branch 'GWTII-163_Map_Legend_Widget' into GWTII-171-PluginIntegration

Conflicts:
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/CoreWidgetViewFactory.java
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/resource/CoreWidget.css
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/resource/CoreWidgetClientBundleFactory.java
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/resource/CoreWidgetClientBundleFactoryNoStyle.java
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/resource/CoreWidgetNoStyle.css
Merge branch 'GWTII-163_Map_Legend_Widget' into GWTII-171-PluginIntegration

Conflicts:
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/CoreWidgetViewFactory.java
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/resource/CoreWidget.css
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/resource/CoreWidgetClientBundleFactory.java
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/resource/CoreWidgetClientBundleFactoryNoStyle.java
	plugin/corewidget/corewidget/src/main/java/org/geomajas/gwt2/widget/client/resource/CoreWidgetNoStyle.css
Merge remote-tracking branch 'origin/GWTII-171-PluginIntegration' into GWTII-171-PluginIntegration