Removed world stack #7
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Our weird combination of dependency injection AND using a world stack led to a lot of bugs. Forgetting to push the world could lead to a crash (but only in specific circumstances), and forgetting to pop (which STILL happens in a few places in the main branch) leads to the stack slowly growing over time.
The world stack made multi-threading difficult, it has been replaced with dependency injection. Script components now hold references to the world, and the world is guaranteed not to move around in memory