Adds IconWithPanel UI widget.
Adds IconWithPanelTest.
Small MockupUITest improvements.
Sets openPanel to null when hiding.
Adds Settings widget and I18N messages.
Improves MockupGallerySkinTest.
Fixes I18N#currentLanguage attribute.
Changed skin and added some icons.
Added BaseGallery and ToolbarIcon
Merge pull request #723 from RotaruDan/iconWithPanel

Icon with panel UI widget.
Merge pull request #725 from gorco/baseGallery

Base gallery
IconWithPanel now extends ToolbarIcon.
Fixes UI tests.
Merge pull request #726 from RotaruDan/iconWithPanelImprovements

Icon with panel improvements