Implements `StupidHunt` and `CanApproachTarget` for TechnoTypes.

[CCHyper]

Closes #680

This pull request implements StupidHunt and CanApproachTarget for TechnoTypes from Red Alert 2.

[TechnoType] StupidHunt=<boolean> Should this unit just head towards the enemy if possible rather than assigning itself a nearby target (applies to computer-controlled units in the campaign only)? Defaults to no

CanApproachTarget=<boolean> Should this unit can continually move towards its intended target with the intention of gaining more accuracy? Defaults to no

It also implements a modifier CanApproachTarget, also from Red Alert 2;

[General] ApproachTargetResetMultiplier=<float> The "approach target" position should be recalculated if the target is now more than weapon range times this value. Defaults to 1.0