JSR 205/120 cleanup on midlet removal

This package notifies the Wireless Messaging Subsystem (JSR 205 or 120) when a midlet is removed, so that it can perform any cleanup, like deleteing messages.

- com.sun.midp.wma.WMACleanupMonitor

The function of this class is to call a native function, when a MIDletSuite terminates. The native function will perform any cleanup that is required, eg: delete any messages left unread by the MIDletSuite. This class implements the {@link com.sun.midp.main.MIDletProxyListListener} interface and is thus notified whenever a MIDletSuite is installed or removed. The methods here are called at appropriate times.

At startup `init` is called by {@link com.sun.midp.main.MIDletSuiteLoader} to initialize any necessary cleanup handling when the application exits.

When a MIDlet is about to created the `midletAdded` method is called, but it is a no-op here.

When a MIDlet state is updated the `midletUpdated` method is called, but it is a no-op here.

When an error occurs while starting a MIDlet the `midletStartError` method is called, but it is a no-op here.

When a MIDlet has been destroyed the `midletRemoved` method is called and it calls a native method to delete any unread messages in the inbox.

Note: The JSR 205 specification requires that unread messages not be deleted. The deletion will happen only if built with DELETE_WMA_MSGS = true.