Give configuration option to soften guild message notices

Some users like using the identity addon in guild chat because they hop across many different toons.  This branch provides the option out_mod to reduce the checking that other addons may have done to the guild chat channel.

Settings: On means that the default behavior of checking for Identity changes is enabled and prevents the user from sending the message.  Off means that the manipulation check is supressed. On is the default behavior of this variable, so no default behavior changes.