Fork shimgen into main repo

We use https://github.com/71/scoop-better-shimexe but it's small enough that I think we should maintain it in this repo. I already had to fix several bugs upstream.

added statushelp-needed typediscussion typeimprovement labels

added scopewindows label

mentioned in commit 712d7a07

mentioned in merge request !118 (closed)

mentioned in commit e8b0c03f

closed with commit c7393bd7