Creates a Z-buffer for a bitmap.
Creates a Z-buffer using the size of the BITMAP you are planning to draw
on. Several Z-buffers can be defined but only one can be used at the same
time, so you must call set_zbuffer() to make this Z-buffer active.
Returns the pointer to the ZBUFFER or NULL if there was an error. Remember
to destroy the ZBUFFER once you are done with it, to avoid having memory
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