Improved/fixed macOS support (#4153)

* Fix macOS notifications
* Change CFBundleIdentifier to match domain
* Distribute Stash.app
* Also build universal phasher binary
* Fix binary name in check_version.go
* Expose GOOS, working dir and home dir in systemStatus endpoint
* Disable setup in working directory when running Stash.app
* More Makefile improvements, remove unused scripts
* Improve READMEs and documentation

pkg/fsutil/dir.go

@@ -45,6 +45,16 @@ func IsPathInDirs(dirs []string, pathToCheck string) bool {
 	return false
 }
 
+// GetWorkingDirectory returns the current working directory.
+func GetWorkingDirectory() string {
+	ret, err := os.Getwd()
+	if err != nil {
+		// if we can't get cwd for whatever reason, just return "."
+		ret = "."
+	}
+	return ret
+}
+
 // GetHomeDirectory returns the path of the user's home directory.  ~ on Unix and C:\Users\UserName on Windows
 func GetHomeDirectory() string {
 	currentUser, err := user.Current()