Add actionMapper that ignores prefixes

The prefixes 'method:' and 'action:' are treated specially in struts2.

The treatment for 'method:' can be deactivated by 'useDynamicInvocation=false' but the treatment of 'action:' cannot be deactivated.

I think it would be useful if the following actionmapper is included in the library so people can easily deactivate all special treatment:

package org.apache.struts2.dispatcher.mapper;

import org.apache.struts2.util.PrefixTrie;

public class IgnorePrefixActionMapper
	extends DefaultActionMapper
{
	public IgnorePrefixActionMapper()
	{
		super();
		// remove any injected prefix treatments
		prefixTrie = new PrefixTrie();
	}
}

The reason I want to disable all this is that I do not want anyone to change the behavior of the implemented application by using these techniques.