[Trinidad] Make ExternalContextUtils a public API

[Scott O'Bryan]

Hello everyone,

Trinidad has an internal class 
(org.apache.myfaces.trinidadinternal.util.ExternalContextUtils) which 
contains some convenience methods used throughout Trinidad in order to 
handle ExternalContext objects which may be backed by a portal.  It is 
used especially inside Trinidad's own Configurator framework which is a 
public API.

When making my own configurators for the upcoming RichClient incubator 
project, and indeed throughout the Richclient code itself, I have found 
myself using this internal API because it handles a number of usecases 
that are not EASILY handled including working even when the Portal API 
is not in the classpath.

As a result, I'm wondering what people would think about promoting this 
internal class to our public API?

Scott