improve language swipe cycling

[codokie]

I've added a setting to adjust the sensitivity of the language swipe/slide gesture distance sensitivity. The current step value does not work well on some devices like S22+. Here is the current behavior:

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https://github.com/Helium314/HeliBoard/assets/151087174/a45d1af1-aacd-403e-aaff-9c1846ae6751

And with the new default Medium option selected:

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https://github.com/Helium314/HeliBoard/assets/151087174/4368b2b0-db14-450e-8ac1-ce6909b885fe

fixes #255 and #614