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

pkg/exec/command.go

@@ -0,0 +1,11 @@
+// Package exec provides functions that wrap os/exec functions. These functions prevent external commands from opening windows on the Windows platform.
+package exec
+
+import "os/exec"
+
+// Command wraps the exec.Command function, preventing Windows from opening a window when starting.
+func Command(name string, arg ...string) *exec.Cmd {
+	ret := exec.Command(name, arg...)
+	hideExecShell(ret)
+	return ret
+}