Fusesoc and Linter

Created by: wallento

This adds support for FuseSoC. As example, it fixes the verilator model to directly use it. But even more interesting, it adds a github action that automatically runs the linter on each push and pull request. When the linter fails, the action fails and a PR can be polished. As a caveat, there are 421 Linter warnings on the codebase at the moment. I have added a waiver file that suppresses them, but I suggest to fix the issues or replace the placeholder comments with an explanation. Happy to help, but too many for a "quick PR".