Bug 402304: Migration: UI dependent tests

* migrate tests for TableMultilineListener
* add an ISwtIconLocator interface for SwtIconLocator
* remove Ignore import in SwingScoutModelFinderUiTest

https://bugs.eclipse.org/bugs/show_bug.cgi?id=402304
Merge branch 'bug402304' into master_testing

Conflicts:
	org.eclipse.scout.rt.ui.swt.test/src/org/eclipse/scout/rt/ui/swt/ext/table/internal/TableMultilineListenerUiTest.java
	org.eclipse.scout.rt.ui.swt/src/org/eclipse/scout/rt/ui/swt/util/ISwtIconLocator.java