Allow hijacker to capture vehicles in place of being crushed.

[SoScared]

This feature introduced with SirCake's UOE mod maps link both made the unit more reliable and reduced the bug experience associated with hijacking. Although the balance implications are less than clear this feature ought to be incorporated and eventual balance adjustments would follow.

As of now SirCake's crush-hijack implementation still trigger the crush soundeffect+animation and a "unit lost" announcement.