Bug 49117 [Plan Item] Workbench needs hooks for new welcome support
M6 We need to provide an extension point and some interfaces to allow for a primary feature to declare a welcome page. This extension point will be tied the new IProduct being defined by the Core team and needs to have 3 states 1) Fill whole screen 2) Collapsed on the right when the user selects something and starts working 3) Disables when it is no longer of any use
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/IDEWorkbenchPlugin.java
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 * All rights reserved. This program and the accompanying materials 
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 * Contributors:
 *     IBM Corporation - initial API and implementation
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package org.eclipse.ui.internal.ide;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.boot.BootLoader;
import org.eclipse.core.boot.IPlatformConfiguration;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IPluginDescriptor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.ui.IWorkbenchPreferenceConstants;
import org.eclipse.ui.ide.IDE;
import org.eclipse.ui.internal.AboutInfo;
import org.eclipse.ui.internal.ide.registry.CapabilityRegistry;
import org.eclipse.ui.internal.ide.registry.MarkerImageProviderRegistry;
import org.eclipse.ui.internal.ide.registry.ProjectImageRegistry;
import org.eclipse.ui.plugin.AbstractUIPlugin;