Fixed: Numerous Heretic/Hexen actors and code pointers were sending invalid...

Just as the title states. I made adjustments so that the server wouldn't send out unnecessary commands to the clients. This cuts out the wasted bandwidth in some Hexen maps where clients would constantly be bombarded with commands they couldn't execute as soon as they spawned in. The previous fixes along with this should make Hexen's stability online far better than it ever has been.