Still working on the authentification stuff. Technically, now even in the monolithic...

Still working on the authentification stuff. Technically, now even in the monolithic build the client connects
to the internal core (still using the possible shortcuts, of course). It should also be able to disconnect, although
not all is cleaned up yet in the process. After this is done, one will be able to disconnect the client from the internal
core and connect to a remote core, and vice versa.
This made a lot of changes to the init process necessary, so I have changed quite a bit of stuff around.

You should refrain from building core and client separately now, even though it probably compiles. It is not tested yet,
and the GUI stuff is still missing anyways.