Missile Guidance Overhaul

[PabstMirror]

• Headers
• Modern params/private
• Moved laser seeker range check to ace_laser (so we don't waste time on lasers we can't see)
• Added seekLastTargetPos config (enabled for javelin). If seeker loses LOS of target, will still continue to last known position.
• If seeker returns no position, missile will fly straight instead of trying an attack profile (useful for DAGR)

Picked up some performance gains on the main guidance PFEH:
Before: Average: 0.55397s / 1222 = 0.453331ms
After: Average: 0.436127s / 1269 = 0.343677ms

[ulteq]

I think !(_lastKnownPos isEqualTo [0, 0, 0]) is faster than (vectorMagnitude _lastKnownPos) != 0

[PabstMirror]

It looks about even in my testing but not enough precision to say for sure:
20x of each:

x3 = !([0,0,0] isEqualTo [0,0,0]);
x4 = !([0,0,1] isEqualTo [0,0,0]);

0.0639 ms 0.065 ms 0.0636 ms

x3 = (vectorMagnitude [0,0,0]) != 0;
x4 = (vectorMagnitude [0,0,1]) != 0;

0.0633 ms 0.0617 ms 0.0628 ms

x3 = (vectorMagnitudeSqr [0,0,0]) != 0;
x4 = (vectorMagnitudeSqr [0,0,1]) != 0;

0.0631 ms 0.0615 ms 0.0633 ms

But [0,0,0] is kind of a magic value, so isEqualTo might be clearer