Introduced @AllWindowsClosed method annotation to be used by session beans that need to be notified when all the browser windows are closed.

As a good practice the session bean that has one of its method @AllWindowsClosed annotated should be created eagerly, on session startup. This way there is no need to insert references to this bean in all the pages in order to be certain that the bean is created before its method will be invoked.

Recent check in related to this case was breaking the build:

compile:
[javac] Compiling 70 source files to /Users/Ken/Code/svn/grimlock/icefaces/core/build/classes
[javac] /Users/Ken/Code/svn/grimlock/icefaces/core/src/main/java/org/icefaces/impl/application/WindowScopeManager.java:24: cannot find symbol
[javac] symbol : class AllWindowsClosed
[javac] location: package org.icefaces.bean
[javac] import org.icefaces.bean.AllWindowsClosed;
[javac] ^
[javac] /Users/Ken/Code/svn/grimlock/icefaces/core/src/main/java/org/icefaces/impl/application/WindowScopeManager.java:581: cannot find symbol
[javac] symbol : class AllWindowsClosed
[javac] location: class org.icefaces.impl.application.WindowScopeManager.AllWindowsClosedNotifier
[javac] callAnnotatedMethod(object, AllWindowsClosed.class);
[javac] ^
[javac] Note: Some input files use or override a deprecated API.
[javac] Note: Recompile with -Xlint:deprecation for details.
[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.
[javac] 2 errors

Checked in the missing AllWindowsClosed interface.

Cleanup the scope maps that expired when all windows are closed.

Cleanup the scope maps that expired when all windows are closed. Alos, notify eagerly @PreDestroy on the remaining window scope beans.