usage of namespaces

[Ingo Ruhnke]

As some names in Pingus get a bit ugly (PingusWorldMapEmptyNode, etc.)
I plan to integrate a few namespaces into Pingus.

namespace Pingus:
 * main namespace for everything in Pingus 

namespace Pingus::WorldMap
 * everything in src/worldmap/

namespace Pingus::Editor
 * everything in src/editor/

and maybe a few other where it makes sense. Any objections or comments?

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