Sets AI Private to a light blue color.
Adds AI Private to communications.dm
Adds a name for AI Private to broadcaster.dm.
Adds a name for AI Private in radio.dm.
Makes AI Private magenta!

The AI player is certain to notice this channel, because it is eye bleach!
Reflects the color change for AI Private

Changed "light blue" to "magenta".
Merge pull request #3243 from GunHog/BLUE_AI_PRIV

Adds a name and light blue color to AI Private channel on the radio.