refactor: Un-singletonize Paths & Updates (#5092)

src/singletons/Updates.hpp

@@ -5,11 +5,19 @@
 
 namespace chatterino {
 
+class Paths;
+
+/**
+ * To check for updates, use the `checkForUpdates` method.
+ * The class by itself does not start any automatic updates.
+ */
 class Updates
 {
-    Updates();
+    const Paths &paths;
 
 public:
+    explicit Updates(const Paths &paths_);
+
     enum Status {
         None,
         Searching,
@@ -21,9 +29,6 @@ public:
         WriteFileFailed,
     };
 
-    // fourtf: don't add this class to the application class
-    static Updates &instance();
-
     static bool isDowngradeOf(const QString &online, const QString &current);
 
     void checkForUpdates();