bug fixes
reverted weld rate to 50
undone build limit of 1 MAC per structure
reduced build efficiency from 75% to 33%

fixed minor bug

MAC follow-and-weld no longer solely focuses on the primary target.
MAC follow-and-weld closer to target.
Reduced MAC auto task search radius from 15 to 12.
Increased MAC vision range to 10.
Reduced MAC FoV while moving to 120.
MACs can now be welded even while taking damage.
Added Hold Position order to MACs.
Increased MAC auto task searching frequency, from 1.0 to 0.5s.
MAC are more relaxed about move order precision, and don't alway face the same direction after stopping.
MAC jets switch on and off more intelligently.