Support wifi searching in Windows (via Powershell)

[cantsin]

Windows support for session-counter 🎉 Includes a smattering of bug fixes along the way.

{"file":"C:/Users/jtran/imls-pi-stack/imls-raspberry-pi/cmd/session-counter/session-counter.go:63","func":"main.run2.func1","level":"debug","msg":"RUNNING SIMPLESHARK","time":"2022-05-12T14:41:00-07:00"}

A few notes:

• We rely on Powershell to get the approximate equivalent information from lshw.
• Includes a refactoring of GetDeviceHash -- this code could be clearer. In particular, the Powershell script generates JSON, which we unmarshal into a NetInfo and then... move that data into a []map[string]string. Yeah.
• This includes a separate fake serial "fix" -- since I'm too lazy to regenerate an encrypted api key, I just truncated the fake serial for API submission. We should fix this, but... 😣
  • Removed. I think this is an artifact of how we are using ReVal, actually, and we can revisit this issue when we simplify the stack and add go validation.
• Tests? What are these?

[cantsin]

Note to self: should probably refactor the runtime.GOOS checks to be out of the hot path too. "Hot" here is relative, though, we only run these goroutines at most once a minute, but I'm a bit worried that the Powershell command takes a while to execute too.