[FEATURE] Predefined variables for CPU/Memory usage, etc about eww HOT 8 CLOSED

If anything, these would be added as "magic variables". For that, we'll first need to implement the #52 lazy evaluation ticket, to avoid having code run unnecessarily.

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Wait why do we need to implement #52 first? Isn't that issue wanting Haskell in eww or something?

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yea, that issue was incredibly stupidly framed. I updated the description, now it should actually explain what it does ;D

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it wasn't stupid.. i was lazy

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Well that issue is closed now but im not sure if this is a good idea maybe if its under a feature or something or as part of example eww widgets or smth

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@legendofmiracles has started working on this in https://github.com/legendofmiracles/eww/tree/predefined-variables

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@elkowar this can be closed

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Implemented in #117

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