Signal processing refactor

[marcosmc]

Refactored the tool to move all methods that modify curves into a “curve manager”, responsible for:​

• Detecting the type of Producer’s curves, which could be either:​
  • Simulate curves using Dynawo if a model is available from the producer's network.​
  • Import user-provided curves from files (note these are different from Reference Curves).​
• Splitting curves into windows for model validation (3 for fault tests, 2 for ref-tracking tests):​
  • Also adding the exclusion zones at the beginning & end of each window. These are:​
    max (IEC_QSS_exclusion, Low_Pass_Filter_exclusion)​
• Data is internally handled as:​
  whole curve + {metadata about window-splitting and exclusion zones}​
• Low-pass filtering of curves:​
  • Performed separately on each window​
  • options: crit_damped, bessel, butter, cheby1​
  • prescribing a default exclusion zone for getting rid of boundary effects, ~ 20 ms