- Frequency is a new parameter in json file
- Set wide acceptance ranges of other test stand parameters for demo purposes

Ploting window is now in PDF format not in png format

plot is now saving with CSV file with same name .It doesnt pop up now after reading.

Works correctly for failing and working stable condition during the
measurement phase, but does repeat yet when it fails.

Also did code cleaning

read_data now returns a data class instead of a list

- mostly whitespace and linebreaks
- no functional change

- adapted simulated time constants

- temperature and humidity indicator working again
- magnitude and phase indicator not working yet
- improved plotting ranges

Added function to avoid code duplication in perform_measurments function

Set position of y_axis of equilibrium_indicator for both subplot and assign it a label

Modified plotting function,which returns two subplots for temperature, humidity and magnitude, phase separately

Modified 'get_clock' function

added a function that returns single instance of SimulateState

Imported 'shared_simulated_state' module and use it in dummy rather than virtual_time and simulated_temperature and simulated_humidity
Added functions that returns single instance of dummy