Simpler design alternatives

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the design right now looks like this:

• simulators can have systems added to
• simulators are aware of program entities
• when a simulator updates forward, they update systems and then programs

and its quite a lot of steps, feels like the underlying code is jumping through more hoops than it needs to. i dont think it should be that way, and the reason why the design is as such is so that one simulator instance can be created, while multiple programs can be made to run in sequence or parallel:

using World world = new();
using Simulator simulator = new(world);
using Program<A> a = new(world);
using Program<B> b = new(world);
while (!b.IsFinished && !a.IsFinished)
{
    simulator.Update();
}

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the requirements for any alternatives are these then:

• registering systems to run for a specific world
• the systems that are registered should be able to utilize their own constructor and dispose methods

and thats about it. the programmer can always spawn more worlds for different uses, and they should be able to choose which systems run for each one of them. thats effectively building the simulator/vm construct.

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design alt A:

using World world = new();
using Simulator simulator = new(world);
using AnotherSystem system = new();
simulator.Register(system);
while (simulator.Update())
{
}
simulator.Unregister(system);

which could be wrapped into a custom type:

public struct GameSimulator : IDisposable
{
    private Simulator simulator;
    private AnotherSystem system;

    public GameSimulator(World world)
    {
        simulator = new(world);
        system = new();
        simulator.Register(system);
    }

    public bool Update() => simulator.Update();

    public void Dispose()
    {
        simulator.Unregister(system);
        system.Dispose();
        simulator.Dispose();
    }
}

if there are multiple "programs" with their own unique code, multiple simulators would be created and destroyed. which would be more costly than the current approach.

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being done in #6

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done in the mentioned pr