| colors | An array of pixel colors. | 
| arrayElement | The texture array element index. | 
| miplevel | The mip level. | 
Set pixel colors for the whole mip level.
This function takes a color array and changes the pixel colors of the whole
mip level of the texture. Call Apply to actually upload the changed
pixels to the graphics card.
See Also: SetPixels32, SetPixelData, GetPixels, Texture2D.SetPixels, Graphics.CopyTexture.