When the areaportalMask changes invalidate all cached clusters.
When the areaportalMask changes invalidate all cached clusters.

Invalidating only the current view cluster is not enough, because the
player can walk back into an already cached cluster which then would
be drawn based on the old areamask setting.

DaemonEngine/Daemon,DaemonEngine/Daemon,DaemonEngine/Daemon,DaemonEngine/Daemon