[readd] games/hedgewars

Hi,

This is a revised port from my last attempt to readd games/headgewars,
in its last version.

The client for hedgewars can be built again since its dependency
lang/fpc had been readded into the ports.

The server flavor, however, could not be built; for lots of its haskell
dependencies got deleted from the ports.

Comments?

Lucas de Sena.