[crossfire] Buildable Land Plots

[Anton Oussik]

Not tying down a deed to a space certainly makes it easier. Also
combining building plans with deeds seems sensible, since a player
would know what sort of thing they would want to buy.

If I understand correctly, those deeds (like a tower deed) would only
provide a base building which can then be expanded/improved using
things from building shop.

Another small idea - ability to name the map entrance as it will
appear on the world map, like "Casper's home". This would allow
players to easily find the right plot.