QEP: Usability Related Functionalities

###Misc #####Keyboard based menu #####Recently used elements #####Realistic models' values #####Components' stress testing #####FFT in cartesian like diagram without using the equation #####Live graphing support #####Easy library sharing support #####Temperature sweep test #####Support for simulating MCUs; AVR, ARM etc. #####Y-Axis autoscaling issue in cartesian diagram #####Parametric test automation using a Python script #####Sound capture and storing support

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###Qucs component library #####Add library editor #####Libraries sharing (online and via files) #####Online libraries database and libraries updater #####Existing (e.g. KiCAD) libraries support and Qucs<-->AnyCAD libraries converter