Precompilation of prefix header for GCC and Clang requires some efforts thanks to CMake which doesn't support this feature out of the box
Existing thirparty solutions must be tuned to our needs, and our configuration should be adjusted to a chosen module
If we ever want to refactor the global level data these must not reference the 'level' variable.
The main parts of the map loader cannot use this information, because it can only be created after running the node builder, so it got its own set of index functions instead.
