Fix archetypes_generation being incorrectly updated for systems #383
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The issue for this (#294) mentioned query systems not having this issue but it turns out they have the same issue, except instead of panicking they'll just run anyway and let you have multiple mutable borrows on the same components. This PR fixes it for both types of systems but it's probably worth investigating why one panics and the other is just UB.
resolves #294
resolves #259