[libre-riscv-dev] daily kan-ban update 12jul2020

[Jacob Lifshay]

today:
found the root cause and created a fix for nmigen's zeros in vcd issue

Finished off the pull request for adding string-typed vcd variables
and for outputting values as strings instead of u64 values:
https://github.com/sgpthomas/vcdump/pull/1

Jacob