Feature: Add ability to include golang sources

[boris-smidt-klarrio]

Since most go binaries are build on top of opensource libraries it might be useful to include extra source code from github directly.
Then you could show a 'decompile' with the actual go source code.

I.e. when i see this in the binary:

 /go/pkg/mod/github.com/miekg/dns@v1.1.61/defaults.go

It could show me this in a 'decompile/source' window:
https://github.com/miekg/dns/blob/v1.1.61/defaults.go#L25