Use go mod + auth + encryption + unittests

[migueleliasweb]

I would like to make som improvements do this project like authentication, persistence encryption and also properly import stuff from https://github.com/sabhiram/go-wol. It would be great if you were using go mods as it makes it much easier to import other libs.

I would be happy to make a PR for this. Would you be ok with this?

I'm happy to start with a PR to shuffle things around and make it easier to use modules. Then I can raise other PRs for the extra features.

Ping @daBONDi