Build

• nsis: use EnVar plugin for path env variable updates

Feat

• ci: add GitHub action workflows for tests and release
• npm8: support npm 8 by fixing symlinks during installation
• npx: add shim for npx

Fix

• build: use last x86 node version, fix last npm version and usage of symlinks
• building shims: use go modules and an existing fork of go-debug
• chore: update dependencies, changelog, usage and build templates
• tests: fix tests and add check for node and cleanup before run
• build: fetching of latest npm version could fail