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Everything (entity sprites, effects, decoration, path sprites etc) is drawn
in an elegant way, and in the correct order.

It manages all the sprites and various graphical things related to drawing
the path/movement etc

see https://en.wikipedia.org/wiki/Alpha_max_plus_beta_min_algorithm

They do not need to know anything about the Camera or any of their screen
position, they just draw themselves around the 0:0 coordinates, and they use
the given sf::RenderStates (which contains the translation to draw the
Sprite at the correct screen position).

And fix a few related things in Tasks and Works

Instead of just RemoteClient

And use it between the master server and the menu client
We still need to use that between the slaves and the master server (with
client certificate verification), but all the work is basically done

fix #2352

Only TCPSocket are available at the moment, but this will be useful to use a
TCPSocket easily

It manages subprocesses, wait for the SIGCHILD, etc