Revert "Project modernization (#630)"

This code was not tested and breaks in Release builds, reverting to restore
functionality of the nightly. All in-game menus do not work and generating
a world crashes.

This reverts commit a9be52c41a.

Minecraft.World/WaterLevelChunk.cpp

@@ -160,5 +160,5 @@ void WaterLevelChunk::setLevelChunkBrightness(LightLayer::variety layer, int x,
 
 Biome *WaterLevelChunk::getBiome(int x, int z, BiomeSource *biomeSource)
 {
-	return nullptr;
+	return NULL;
 }