Fixed the problem of <=r548 clients fucking up maps on >=r549 servers. Also, already fucked up maps are now loaded correctly.

Hopefully fixed u64 to be the actual 64-bit type on 64-bit architectures. This should fix the compiler error caused by irrlicht on 64-bit fedora defining u64 to be different.

A small fix to an unlikely situation where the map generator requires a block that hasn't been loaded from disk. Now it is actually loaded from disk in that case.

Attempt to fix a problem with the factory mappings of objects residing in different source files than the prototype objects that fill them in

Fixed objects being sometimes not able to be stored statically in a block when block has been unloaded