[Client] Improved overlapping of movement commands

The client is now using the ping time to the server to overlap the
movement commands. This should give those with a slow ping time a
improvement for the walking.
Merge branch 'develop' of ssh://github.com/Illarion-eV/Illarion-Java into develop
[MapEditor] Fix copying of maps

The data and the quality values are not property transferred in case a
map is copied.
[Client] Calculate max ping to issue walking command early