Name change to be more searchable, A.I -> AI

Soviet Guards and Guards Airborne priority increased for Expert.

Let me know if there's any problems with the name change.

(Very) Minor adjustments to Ostruppen doctrine build order.

Updated Wehrmacht Ostheer early build order.

A.I will use scouting abilities again now, albeit much rarer.

Minor update, M10 (Both USF and UKF variants) will now be built more. OKW Puma will now prioritize vehicles more.

Small update, Rear Echelon Volley Fire is now enabled and will be used only under very specific conditions.

OST A.I will now upgrade starting base defenses to medical stations, at the normal cost of bunker+upgrade. Soviet Hard & Expert A.I early build orders updated.

Also, Easy A.I has 0.8x resource multipliers for now. This is intended to be a stop-gap measure until I find better ways to create an easier experience without the resource debuff.

Minor update addressing OKW Flak Half-Track

Infantry update, they should use more cover from now on. Also reduced the delay between vehicle tactic commands and targetting, let me know if it creates performance problems.

Flak Half-tracks (USF and OKW) will now use handbrake to shoot.