Added docs and project management tool update

doc/bu/files/actorisvisible.txt

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+#title ActorIsVisible [RCBasic Doc]
+#header function ActorIsVisible( actor )
+
+Returns true if an actor is visible
+
+#code
+SetActorVisible(actor, true)
+Print "Actor solid state: "; ActorIsVisible(actor) 'Outputs 1
+SetActorSolid(actor, false)
+Print "Actor solid state: "; ActorIsSolid(actor) 'Outputs 0
+#/code
+
+#ref SetActorVisible