SOC1-141: Restructured deconstruction buffer to remove registers and do packet...

Closes SOC1-153

See merge request soclabs/accelerator-wrapper!31

SOC1-153: Updated Read Address Calculator to Address Calculator so can be used for input address calculation

SOC1-141: Restructured deconstruction buffer to remove registers and do packet breakdown on engine output port data

SOC1-121: Reworked simulation flow, updated RTL to fix simulation bugs and moved modified CMSDK files

SOC1-141: Updated Filelists to work with Icarus Verilog and changed accelerator environment variable name

SOC1-141: Parameterised Packet Constructor, re-worked ahb interface and created new top-level packet constructor module