Phase system

Players may 'cast phase' at any time to become ghostlike, immovable, and
unattackable. Phased players may not do anything at all, not even heal
wand.

After a certain duration, they will be deliveranced. Phasing out
simulates logging out without actually closing the client, and in fact
allows players to be their own scout. Casting phase again will phase
them back in, and they can make a run for it. However, all enchantments
are frozen just like logging off, and negative enchantments still get a
3 second duration increase.

Penalties and integration with current ghost system to come.