Energy trader side texture

[monokei]

The energy trader's output sides cannot be distinguished from a regular side. Only two (or one, cannot tell) sides are outputting power, but you can never tell which one. You have to hit it relentlessly with a wrench to rotate it, until you find the right side.

Would be nice for the traders to have own independent textures for each side, like all other machines.
Adding energy out overlay would also do the trick.