Get NPCs to revert to the correct 'resting' animation (e.g. stand or hover) after finishing their movement. This also fixes judder after an avatar has finished "go here"/autopilot movement in a viewer.

This meant reseting the SP.AgentControlFlags since the Animator uses these to determine the correct default animation.

OpenSim/Region/OptionalModules/World/NPC/Tests/NPCModuleTests.cs

@@ -131,6 +131,7 @@ namespace OpenSim.Region.OptionalModules.World.NPC.Tests
             double distanceToTarget = Util.GetDistanceTo(npc.AbsolutePosition, targetPos);
             Assert.That(distanceToTarget, Is.LessThan(1), "NPC not within 1 unit of target position on first move");
             Assert.That(npc.AbsolutePosition, Is.EqualTo(targetPos));
+            Assert.That(npc.AgentControlFlags, Is.EqualTo((uint)AgentManager.ControlFlags.NONE));
 
             // Try a second movement
             startPos = npc.AbsolutePosition;