Match C&C cloaking behaviour.

[OmniBlade]

While close, the current implementation apparently doesn't quite match the behaviour of the cloak effect in the original C&C, with the haze being "right leaning" rather than "left leaning". This needs to be investigated and fixed at some point.

[tomsons26]

Apparently it depends how close to the edge it is, it reverses direction then. Noticed this in TD just now.

[OmniBlade]

The functions that control this are a hideous hand coded ASM unrolled loop, I'll have to try and figure out how the code should look for both directions.