#2 Graphical terrain map

[Simon]

At some point in time, someone should write a gui around the Terrain class. This should display a given terrain class as wire model in default colours and also paint any contained objects at the corresponding position if they have one. It could also support drag&drop to change the position of these objects.

If contained (ingame-)objects do not have a certain position in a terrain, then a nice way of displaying these should be found too.