bug fix- player character may not fall below landscape after battle.
AI cavalry don't stop without reason.
Phalanx rotation update fixed



Close combat AI changed. Soldiers fight way better than before.



https://youtu.be/rp2Pfdqco0c



Soldiers keep strict formation when they are marching.

Hostile closest army search function runs on background thread.
Each Soldier formation location calculation runs on background thread.
Vehicle rotation calculation runs on background thread

Post process version updated to UE 4.22.