Feat/reorganize code

Let's use a more structured folder system: https://github.com/golang-standards/project-layout

• Resolves: #99 (closed)

cmd/bitmask-connect/main.go

+// Copyright (C) 2018 LEAP
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+
+	"0xacab.org/leap/bitmask-systray/pkg/bitmask"
+	"0xacab.org/leap/bitmask-systray/pkg/config"
+	"golang.org/x/text/language"
+	"golang.org/x/text/message"
+)
+
+const (
+	logFile = "systray.log"
+)
+
+var version string
+
+func main() {
+	displayVersion := flag.Bool("version", false, "Display the version")
+	flag.Parse()
+
+	if *displayVersion {
+		fmt.Println(version)
+		os.Exit(0)
+	}
+	start()
+}
+
+func start() {
+	signalCh := make(chan os.Signal, 1)
+	signal.Notify(signalCh, os.Interrupt)
+
+	b, err := bitmask.Init(message.NewPrinter(language.English))
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer b.Close()
+
+	err = b.StartVPN(config.Provider)
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
+
+	<-signalCh
+}