Vladislav Osmanov

[OLED] Cyrillic support & localization guide

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* Cyrillic font for OLED * OLED localization guide

With this modification of the `SSD1306I2C` class it's now possible to use the library with `framework = espidf` in PlatformIO.

"Stream data size" and "Stream message count" are missing filtering expression and always display full set of metrics (despite of selected servers or/and strems).

Opposite sign on imaginary part in result of DSPUtil.Fourier.FFT()

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Comparing to Python's scipy/numpy FFT (http://docs.scipy.org/doc/numpy/reference/routines.fft.html) there are wrong sign on computing imaginary part of the result (absolute value is ok).

Consider using `System.Numerics.Complex` type from Microsoft .NET Framework 4.0 instead of your custom `DSPUtil.Complex`. I have checked `System.Numerics.Complex` with Fourier.FFT - it works.