version 4 by Mark Tilford
Section - Chat node activation
Activatedness is a kind of value. The activatednesses are sc-active, sc-inactive, sc-once and sc-shown-once.
A chat node has an activatedness. The activatedness of a chat node is usually sc-active.
To activate (chosen node - a chat node): now chosen node is sc-active.
To deactivate (chosen node - a chat node): now chosen node is sc-inactive.