Deprecate the Direction properties and replace with forward. Also give more descriptive description of what they do.

Source/Engine/Level/Actor.cpp

@@ -822,6 +822,11 @@ void Actor::SetRotation(const Matrix& value)
 }
 
 void Actor::SetDirection(const Float3& value)
+{
+    SetForward(value);
+}
+
+void Actor::SetForward(const Float3& value)
 {
     CHECK(!value.IsNanOrInfinity());
     Quaternion orientation;