Returns the name of the color scheme currently in use. When I use certain color schemes, I like to display the default text on certain events differently. This identifier makes that easier, enabling my events to show the default text or not, depending on which scheme is in use.
If not that then an on *:SCHEME: event, that triggers when a scheme is changed. So that an event processing script could be unloaded/loaded. Some people might also find other advantages in on *:SCHEME.
