remove map streaming - lock map to a fixed size

[kwahu]

use a fixed map of:
128 width
512 depth
and proportions of 0.5 : 1 - where we treat each depth pixel as 2 times larger than width pixel

in such way we have 10km length track with the resolution of 10x10m voxels

the whole map fits inside a UWORD size (65536 bytes) of memory and we can perform a type cast to a (UWORD) in the path casting algorithm, to prevent going out of the map table