Project structure refactor:

- Change package name general_server to gateway
- Changing the structure of directories and packages
- Adding vendor to the project

vendor/gopkg.in/natefinch/lumberjack.v2/chown.go

@@ -0,0 +1,12 @@
+//go:build !linux
+// +build !linux
+
+package lumberjack
+
+import (
+	"os"
+)
+
+func chown(_ string, _ os.FileInfo) error {
+	return nil
+}