Software: Handle texture wrapping more accurately

This fixes various texture offsetting issues with negative texture coordinates (bringing the software renderer in line with the hardware renderers).  It also handles the invalid wrap mode accurately (as was done for the hardware renderers in the previous commit).  Lastly, it handles wrapping with non-power-of-2 texture sizes in a hardware-accurate way (which is somewhat broken looking, as games aren't supposed to use wrapping with non-power-of-2 sizes); this has not been done for the hardware renderers.

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