Hi!
I've removed some unused params. But if they where needed for e.g. interface type I've simply `_` them. Also I have to instances to fix tests params, whereby they were passed but not initialized at all, they are in`internal/target/remote/remote_test.go` and `internal/modify/dkim/dkim_test.go`. All test are still passing so it seems like I didn't break anything.
I might've refactored some code away that actually is used but wasn't implemented correctly, but as far as I see their is nothing wrong or erroring going on.
The intention is to keep to repo root clean while the list of packages
is slowly growing.
Additionally, a bunch of small (~30 LoC) files in the repo root is
merged into a single maddy.go file, for the same reason.
Most of the internal code is moved into the internal/ directory. Go
toolchain will make it impossible to import these packages from external
applications.
Some packages are renamed and moved into the pkg/ directory in the root.
According to https://github.com/golang-standards/project-layout this is
the de-facto standard to place "library code that's ok to use by
external applications" in.
To clearly define the purpose of top-level directories, README.md files
are added to each.
