CIC based DDC#30

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tejeez wants to merge 11 commits intoha7ilm:masterfrom

tejeez:cicddc_merged

Commits on May 2, 2017

Added CIC DDC for complex input signal and option to directly read from SHM buffer
tejeez
committed
Some optimization of SHM+DDC and support for delaying the signal
tejeez
committed

Commits on May 3, 2017

Allow combining FFT and averaging in one process for reduced pipe overhead
tejeez
committed
More experimental kludge: combine type conversion in fft_cc_logavg to reduce piping overhead
tejeez
committed

Commits on May 9, 2017

Added shm_cicddc_cu8_c
tejeez
committed

Commits on Oct 30, 2017