[CustomOp] Fix setting of NumReps in Thresholding and N in Eltwise node

[Hotfix] Update minimize accumulator width for bipolar case

Fixes for automatically generated documentation

Predecessor handling refactor and identity fallback

Hotfix: Updating code to use correct numpy types

Hotfix: delete numpy.str in datapacking

Update requirements

Update GHA to use Ubuntu 20.04

Pure C++ Verilator-based FIFO sizing

[Tests] Fix ipstitch test for VitisBuild

Hotfix/end2end tests