Refactor for better modularity (share more code among edit functions, rename "offline" package to "backend"

src/backend/2globalsWIN.go

@@ -0,0 +1,14 @@
+//go:build windows
+
+package backend
+
+// EntryRoot path to libmutton entry directory
+var EntryRoot = home + "\\AppData\\Local\\libmutton\\entries"
+var ConfigDir = home + "\\AppData\\Local\\libmutton"
+var ConfigPath = ConfigDir + "\\libmutton.ini"
+
+// PathSeparator defines the character used to separate directories in a path (platform-specific)
+const (
+	PathSeparator = "\\"
+	Windows       = true // TODO temporary, remove after native sync is implemented
+)