Rotated various things (terrain texture UVs, default light and camera angles) by 45 degrees.

Map XML: Store camera position. Stopped using DTDs (because they make it
too hard to change the XML structure without breaking all the old XML
files).
Game.h: Include fewer files, to make compilation sometimes faster.
World: Changed some things to not be singletons, since they were
(ab)used as CWorld members.

This was SVN commit r3670.

source/graphics/scripting/JSInterface_Camera.cpp

@@ -8,6 +8,7 @@
 #include "MathUtil.h"
 #include "Terrain.h"
 #include "Game.h"
+#include "graphics/GameView.h"
 
 
 JSClass JSI_Camera::JSI_class = {