fix(tools/SensorPlot): Store Sensor Timestamps as long

Storing them as floats like before loses nano second precision.

Closes #34
feat(tools/SensorPlot): Implement iterator for CsvParser

Makes it easier to get the data from a CSV file.
chore(tools/SensorPlot): Cleanup after code inspection

Mostly Whitespace fixes but some other simple fixes.
feat(tools/SensorPlot): Simple (slow) Peak Detector

Implements a simple working but slow peak detector which detects
the S.O.S. peaks.

Closes https://github.com/psycholold/SensorReader/issues/33
Merge pull request #36 from psycholold/33-peak-detection

Feat: 33 peak detection