separates TILES for each zoom level

[vilcum]

Would be possible having separate terrain tile tga files used for each zoom level? ...I mean as it works for counters (and as it worked with the wite1 map btw)

I suspect it would mean more computing requirement, but it would allow for having different map types for each level (as an example a more plain/schematic map at lower levels, or one with heavy differences showing weather...)