Tracks shadows file

The whole file is crypted as all bpk files. Then the structure is as follows

Offset (byte)	Size (bytes)	Information
0	4	number of points
4	4	number of shawdows
8	4 *number of points	x coordenate
12+(4*number of points)	4*number of points	y coordedate
12+ (8*number of points)	4*number of points	z coor. (zero values, not used)
12+ (12*number of points)	4*number of shadows	index to search x, y coor of the first point of the shadow
12+ (12number of points) +(4number of shadows)	4*number of shadows	index to search x, y coor of the second point of the shadow
12+ (12number of points) +(4number of shadows)	4**number of shadows	index to search x, y coor of the third point of the shadow