LMS-731 generic browser - extract code that adds a toolbar

...s/generic/client/web/client/application/SearchWidget.java

...t/web/client/application/framework/ComponentProvider.java

...ient/web/client/application/framework/DefaultTabItem.java

...ent/web/client/application/framework/ITabItemFactory.java

...client/web/client/application/framework/MainTabPanel.java

...b/client/application/ui/experiment/ExperimentBrowser.java

...ient/application/ui/experiment/ExperimentBrowserGrid.java

...t/web/client/application/ui/grid/AbstractBrowserGrid.java

...t/web/client/application/ui/grid/DisposableComponent.java

...lient/web/client/application/ui/sample/SampleBrowser.java

...t/web/client/application/ui/sample/SampleBrowserGrid.java