#137 implement features from Brownbear Analyzer 2000

[Cálestyo]

Hi.

One of the best audio analysers I've ever met is the Brownbear Analyzer 2000 (http://www.brownbear.de/toc.htm).

It offers many different features and visualisation modes (much more that what you see on the one screen short) and also has support for some decoders and demodulators.

Would be awesome if you could have a look at it (it's unfortunately for Windows only) an perhaps re-implement the one or other feature.

Cheers,
Chris.