Continue #2027: make ConsoleManager final

See #2027 (comment)

Author: ruspl-afed

terminal/bundles/org.eclipse.terminal.view.ui/src/org/eclipse/terminal/view/ui/internal/ConsoleManager.java

@@ -56,13 +56,13 @@
  * Terminal console manager.
  */
 @Component(service = ITerminalConsoleViewManager.class)
-public class ConsoleManager implements ITerminalConsoleViewManager {
+public final class ConsoleManager implements ITerminalConsoleViewManager {
 
 	// Reference to the perspective listener instance
 	private final IPerspectiveListener perspectiveListener;
 
 	// Internal perspective listener implementation
-	static class ConsoleManagerPerspectiveListener extends PerspectiveAdapter {
+	static final class ConsoleManagerPerspectiveListener extends PerspectiveAdapter {
 		private final List<IViewReference> references = new ArrayList<>();
 
 		@Override