Reinit ADC completely on each call to AnalogIn.value.#327
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Fixes #326. AnalogIn used to keep around the ADE settings struct, and reference count it. However, now other code uses the ADC (e.g., microcontroller.core.temperaature), so the ADC needs to be completely re-inited each time it's used, since we don't know what state it's in. So now the
adc_configandadc_moduleinstances are just created each time on the stack.