feat(Core/CreatureAI): improve npc position during the combat (#3369)

+ tangent equation to find correct angle and distance when moving

+ implemented proper backward

* Improved performance + random angle margin

* chore: add tollerance calculation in instance

* improved LOS checks with movements

* implemented collisions using raycast (imported by TC)

+ improved collision detection for CanReachPositionAndGetCoords

+ improved collision check

+ set correct flags for the backward movement

+ first implementation of slope angle (to improve)

Co-authored-by: Yehonal <yehonal.azeroth@gmail.com>

src/server/game/Movement/MotionMaster.h

@@ -165,6 +165,8 @@ public:
     void MoveRandom(float wanderDistance = 0.0f);
     void MoveFollow(Unit* target, float dist, float angle, MovementSlot slot = MOTION_SLOT_ACTIVE);
     void MoveChase(Unit* target, float dist = 0.0f, float angle = 0.0f);
+    void MoveCircleTarget(Unit* target);
+    void MoveBackwards(Unit* target, float dist);
     void MoveConfused();
     void MoveFleeing(Unit* enemy, uint32 time = 0);
     void MovePoint(uint32 id, const Position& pos, bool generatePath = true, bool forceDestination = true)