Industrial turrets

[aqpanaciy]

Changes/fixes in the operation of industrial turrets. Initial fixes include:

• search for mineral extraction copied from single-tile scanner;
• use the first suitable target for mining;
• searching and processing targets occurs as a task;
• targets are processed less frequently (not faster than detection).

In the debug environment, 50 turrets work normally at the same time:

[aqpanaciy]

The turret fixes are now here: https://github.com/OpenPerpetuum/PerpetuumServer/pull/496