Critical bug in MCServer

[xoft]

Callbacks are a great way of doing things, though I'd prefer class-callbacks (see cWorld::ForEachPlayer() for an example). Instead of passing a function pointer, you pass a pointer to a class that has overridden a specific virtual method that does the actual work. The advantage is that the class can carry more data (parameters, accumulators etc), the disadvantage is that probably this won't work with Lua (I have no idea).