Do a large chunk of the move to go

This commit moves a huge chunk of the code to go. The TODO.md document
indicates what is left to be done.

cmd/license.go

@@ -0,0 +1,47 @@
+package cmd
+
+import (
+	wisski_distillery "github.com/FAU-CDI/wisski-distillery"
+	"github.com/FAU-CDI/wisski-distillery/env"
+	"github.com/FAU-CDI/wisski-distillery/internal/legal"
+)
+
+// License is the 'wdcli license' command.
+//
+// The license command prints to standard output legal notices about the wdcli program.
+var License wisski_distillery.Command = license{}
+
+type license struct{}
+
+func (license) Description() wisski_distillery.Description {
+	return wisski_distillery.Description{
+		Requirements: env.Requirements{
+			NeedsConfig: false,
+		},
+		Command:     "license",
+		Description: "Print licensing information about wdcli and exit. ",
+	}
+}
+
+func (license) AfterParse() error {
+	return nil
+}
+
+func (license) Run(context wisski_distillery.Context) error {
+	context.Printf(stringLicenseInfo, wisski_distillery.License, legal.Notices)
+	return nil
+}
+
+const stringLicenseInfo = `
+wdcli -- WissKI Distillery Command Line Utility
+https://github.com/FAU-CDI/wisski-distillery
+
+================================================================================
+wdcli is licensed under the terms of the AGPL Version 3.0 License:
+
+%s
+================================================================================
+
+Furthermore, this executable may include code from the following projects:
+%s
+`