Feature: add timing control over sensors

[crashkonijn]

Timers can now be added to sensors, to limit how often it is run.

public static class SensorTimer
{
    public static AlwaysSensorTimer Always { get; } = new AlwaysSensorTimer();
    public static OnceSensorTimer Once { get; } = new OnceSensorTimer();
    public static IntervalSensorTimer Interval(float interval) => new IntervalSensorTimer(interval);
}

public class AlwaysSensorTimer : ISensorTimer
{
    public bool ShouldSense(ITimer timer)
    {
        return true;
    }
}

public class OnceSensorTimer : ISensorTimer
{
    public bool ShouldSense(ITimer timer)
    {
        if (timer == null)
            return true;

        return false;
    }
}

public class IntervalSensorTimer : ISensorTimer
{
    private readonly float interval;

    public IntervalSensorTimer(float interval)
    {
        this.interval = interval;
    }

    public bool ShouldSense(ITimer timer)
    {
        if (timer == null)
            return true;

        if (timer.GetElapsed() >= this.interval)
            return true;

        return false;
    }
}

using CrashKonijn.Agent.Core;
using CrashKonijn.Goap.Core;
using CrashKonijn.Goap.Runtime;

namespace CrashKonijn.Goap.Demos.Simple.Goap.Sensors.Target
{
    [GoapId("Simple-TransformSensor")]
    public class AgentSensor : LocalTargetSensorBase
    {
        public override ISensorTimer Timer { get; } = SensorTimer.Once;

        public override void Created()
        {
        }

        public override void Update()
        {
        }

        public override ITarget Sense(IActionReceiver agent, IComponentReference references, ITarget target)
        {
            return new TransformTarget(agent.Transform);
        }
    }
}