Fix ConcurrentModificationException in tick handlers

[BluSpring]

If a tick handler is registered within a ticking event, the game crashes to a ConcurrentModificationException.
This PR solves that problem by replacing TickManager's LinkedList with a ConcurrentLinkedQueue.

[Saereth]

hey @BluSpring do you have an info on the cause of this, a crash log or anything like that? CME shouldnt really happen here to the best of my knowledge. Im curious if this is some mixin or something perhaps? If you have any more info we'd appreciate it! Ty for the pr

[BluSpring]

Basically, if you register/unregister a tick handler to the same TickManager directly inside the tick method of a TickHandler, it will cause a CME due to a new handler being added to the list or a handler being removed from the list at the same time as that list being iterated.

Reproducing the crash can be triggered by simply registering a new level type TickHandler to a TickManager, and unregistering it immediately within the tick, for instance:

public class TickHandler implements ITickHandler {
    @Override
    public void tick(TickEvent.Type type, Object... objects) {
        Observerlibrepro.tickManager.unregister(this);
    }

    @Override
    public EnumSet<TickEvent.Type> getHandledTypes() {
        return EnumSet.of(TickEvent.Type.LEVEL);
    }

    @Override
    public boolean canFire(TickEvent.Phase phase) {
        return phase == TickEvent.Phase.END;
    }

    @Override
    public String getName() {
        return "Test";
    }
}

@Mod(Observerlibrepro.MODID)
public class Observerlibrepro {
    public static final String MODID = "observerlibrepro";
    public static final TickManager tickManager = new TickManager();
    
    public Observerlibrepro(IEventBus modEventBus, ModContainer modContainer) {
        NeoForge.EVENT_BUS.register(this);

        tickManager.attachListeners(NeoForge.EVENT_BUS);
        tickManager.register(new TickHandler());
    }

    @SubscribeEvent
    private void registerCommands(RegisterCommandsEvent event) {
        // This is used only to register a new TickHandler while in the world, to verify that the CME crash has been fixed.
        event.getDispatcher().register(Commands.literal("testaddtick").executes(ctx -> {
            tickManager.register(new TickHandler());

            return 1;
        }));
    }
}