Bug 290964 Factor out model loading from Workbench so that it is plugable
We want to support different workbench restoreing possibilities and for this we need to delegate the loading to an external instance
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/Workbench.java
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 * Copyright (c) 2008, 2009 BestSolution.at and others.
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 * Contributors:
 *     Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation