Darwinia 2.3.1 release — Darwinia Steam update #382922

This update contains fixes and enhancements since the 2.3.0-25 release. Major changes: Armour will now try to avoid collisions with buildings, and will not allow deploying gun turrets too close to other buildings. Gun turrets were incorrectly accounting for Darwinians, which caused only two of the four ports to be required to operate them. Some mods do not specify any lights in their level files, which causes the landscape and shapes to render as empty black space. We now specify a default lighting configuration if no lights are defined in the level file. This should make such levels at least playable, but they may not appear as the mod developer intended. Greatly improved game controller experience, now using much different thumbstick and trigger axis scaling methods. This was tested with an Xbox Elite controller, but it should improve the experience on any controller, including the Ste...