Make the GUI a general tool, replacing the interact interface
Now the tkinter GUI can be used to select a time_limits or a single file, to select a SID, to select what content to plot and to select a first optional parameters (fft np, more to come)
This GUI is way more easy, clear and smooth than the interact interface using matplotlib natively inside to core of the code.
It is now a pleasant tool, in which we can add any functionalities we want.
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