Finished frontend features with SIMD

Added a frontend module, with a SIMD based frequency shifting

Added lookup for gps CA code and frontend operations with lookup table and SIMD

Added threads for receiving raw samples and template for streaming

Redesign code structure with soapysdr

Added RtlSdr support and make SdrDevice Send

Added DeviceMock for test and updated SdrDevice and RtlSdr for that

Add sdr wrapper that makes uses of crate soapysdr

Updated README

Updated README

Added a wrapper of rustfft and realfft for fft related functions

Change README

Update on plotting functionality

Added plotting support for acquisition and tracking results

Added multi-producer multi-consumer channels for plotting feature