Powerlines

[jetelain]

Should add support for high voltage powerlines, and eventually for other powerlines.

To keep real topology, the wire model will have to be severely deformed, that will require a specific 3d model to reduce the visible effect.

Arma 3 specific : to avoid visual glitches, objects should not more than around 100m long. For wire that are more than 100m, multiple objects will be required.