modernized amRadio code
final tweaks to am radio demo
tweaks to light sensor code while re-editing
tweaking voltmeter to be current
rework on accelerometer, sensitivity pot added
rework accelerometer again, refined, trimmed code
reworked voltmeter to use floats
quick rework of spiEEPROM
Merge branch 'float_voltmeter'

* float_voltmeter:
  quick rework of spiEEPROM
  reworked voltmeter to use floats
  rework accelerometer again, refined, trimmed code
  rework on accelerometer, sensitivity pot added