hassless

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This PR builds on the work of [PR 443](https://github.com/JF002/InfiniTime/pull/443) by approximating the discharge curve using multiple linear line segments. Things to note: * [As suggested](https://github.com/JF002/InfiniTime/pull/443#issuecomment-890351442) by @Riksu9000, 3.5v (instead of...