feat: Movement behaviors (#1815)

* Move in all directions is functional

* feat: add movement behaviors

the following behaviors will function
MoveRight
MoveLeft
FlyUp
FlyDown
MoveForward
MoveBackward

The behavior of the behaviors is once a move in an axis is active, that behavior must finish its movement before another one on that axis can do another movement on it.

dGame/Entity.cpp

@@ -1994,6 +1994,38 @@ void Entity::SetRotation(const NiQuaternion& rotation) {
 	Game::entityManager->SerializeEntity(this);
 }
 
+void Entity::SetVelocity(const NiPoint3& velocity) {
+	auto* controllable = GetComponent<ControllablePhysicsComponent>();
+
+	if (controllable != nullptr) {
+		controllable->SetVelocity(velocity);
+	}
+
+	auto* simple = GetComponent<SimplePhysicsComponent>();
+
+	if (simple != nullptr) {
+		simple->SetVelocity(velocity);
+	}
+
+	Game::entityManager->SerializeEntity(this);
+}
+
+const NiPoint3& Entity::GetVelocity() const {
+	auto* controllable = GetComponent<ControllablePhysicsComponent>();
+
+	if (controllable != nullptr) {
+		return controllable->GetVelocity();
+	}
+
+	auto* simple = GetComponent<SimplePhysicsComponent>();
+
+	if (simple != nullptr) {
+		return simple->GetVelocity();
+	}
+
+	return NiPoint3Constant::ZERO;
+}
+
 bool Entity::GetBoolean(const std::u16string& name) const {
 	return GetVar<bool>(name);
 }