Restructure go project (#2356)

* Move main to cmd
* Move api to internal
* Move logger and manager to internal
* Move shell hiding code to separate package
* Decouple job from desktop and utils
* Decouple session from config
* Move static into internal
* Decouple config from dlna
* Move desktop to internal
* Move dlna to internal
* Decouple remaining packages from config
* Move config into internal
* Move jsonschema and paths to models
* Make ffmpeg functions private
* Move file utility methods into fsutil package
* Move symwalk into fsutil
* Move single-use util functions into client package
* Move slice functions to separate packages
* Add env var to suppress windowsgui arg
* Move hash functions into separate package
* Move identify to internal
* Move autotag to internal
* Touch UI when generating backend

internal/log/hook.go

@@ -0,0 +1,25 @@
+package log
+
+import (
+	"io"
+
+	"github.com/sirupsen/logrus"
+)
+
+type fileLogHook struct {
+	Writer    io.Writer
+	Formatter logrus.Formatter
+}
+
+func (hook *fileLogHook) Fire(entry *logrus.Entry) error {
+	line, err := hook.Formatter.Format(entry)
+	if err != nil {
+		return err
+	}
+	_, err = hook.Writer.Write(line)
+	return err
+}
+
+func (hook *fileLogHook) Levels() []logrus.Level {
+	return logrus.AllLevels
+}