[Bots] Positioning rewrite (#4856)

* [Bots] Positioning rewrite

- Fixes positioning issues where bots could run back and forth or stay at the target's feet.
- Adds checks to ensure bots don't spam positioning updates and complete their initial positioning.
- Cleans up logic and makes it easier to read.

* Cleanup

zone/mob.cpp

@@ -1698,13 +1698,6 @@ void Mob::StopMoving()
 
 void Mob::StopMoving(float new_heading)
 {
-	if (IsBot()) {
-		auto bot = CastToBot();
-
-		bot->SetCombatJitterFlag(false);
-		bot->SetCombatOutOfRangeJitterFlag(false);
-	}
-
 	StopNavigation();
 	RotateTo(new_heading);