server: reimplement namespace as a directory object.

[Vitaliy Margolen]

This a first look at implementing name space inside wineserver as a directory
object. Some things are scatchy, like dealing with dices that should have files
inside them - ex: named pipes. You could look at how I done this with
winstation. Is this is a correct approach to this? Or should I do something
else?

I also added few extra flags to objects, that will have to be used where
appropriate. Also added object type filed to ops. There are few places that
needs this especially directory query function, that has to return type name.

As always, all suggestions comments are appreciated.

Vitaliy Margolen