[Merged by Bors] - Obviate the need for `RunSystem`, and remove it#3817

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DJMcNab wants to merge 6 commits intobevyengine:mainfrom DJMcNab:static_param

+167-142

Commits on Mar 15, 2022

Tidy up the SystemParam derive's requirements

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Add the StaticSystemParam trick

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Migrate to StaticSystemParam

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Add some more docs, and rename inner

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Use assert_is_system instead

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remove old Config api usage
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