Initial commit of fft_pkg
Basic Fgyrus Components Stiched
Intermediate check in

Completed the decimation, windowing & FFT parts of the pipeline. Need to
work on CORDIC & ABS stages. Basic TB components developed.
Completed Fgyrus Design
Basic Fgyrus TB Up

Butterfly level scoreboard is up and completed verification. Seems ok,
just needs 1 bit error tolerance for now.
Fgyrus FFT Verification Complete

Completed integration of all fgyrus scoreboards. Basic data paths in
Fgyrus are verified for FFT. Looks good to go.
Fgyrus Verification complete

Added test to check fgyrus memory accesses. Everything looks good to go.
Features like post FFT normalization & fft_cache coherency will be taken
care of during SW integration.