Add built-in systems

[jackduang]

Why is there no system

[nilpunch]

@jackduang They aren’t strictly necessary, since there are multiple ways to query entities and components. Systems are simple to implement yourself to fit your project’s needs. I’ve been working on a clean, general-purpose design, so eventually there will be a built-in implementation.

[jackduang]

@jackduang它们并非绝对必要，因为查询实体和组件的方法有很多。您可以轻松自行实现系统，以满足项目需求。我一直在致力于一个简洁、通用的设计，因此最终会有一个内置的实现。

Thank u

[jackduang]

ForEach cannot be used in tasks？

[nilpunch]

ForEach cannot be used in tasks？

@jackduang Not sure what you mean by “tasks.” If you’re talking about async tasks, those should work fine. But multithreading isn’t supported out of the box.

[jackduang]

OK