Make humans move based on their last grid's angle (#5122)

* Make humans move based on their last grid's angle

* Fix ghost movement, fix weightless grid parenting

* Make sure to init the last grid angle without needing to move

Content.Shared/Movement/Components/SharedDummyInputMoverComponent.cs

@@ -12,6 +12,8 @@ namespace Content.Shared.Movement.Components
         public float CurrentWalkSpeed => 0f;
         public float CurrentSprintSpeed => 0f;
 
+        public Angle LastGridAngle { get => Angle.Zero; set {} }
+
         public bool Sprinting => false;
         public (Vector2 walking, Vector2 sprinting) VelocityDir => (Vector2.Zero, Vector2.Zero);