refactor: some Application & style things (#5561)

src/singletons/Updates.hpp

@@ -1,11 +1,16 @@
 #pragma once
 
+#include <pajlada/signals/scoped-connection.hpp>
 #include <pajlada/signals/signal.hpp>
 #include <QString>
 
+#include <memory>
+#include <vector>
+
 namespace chatterino {
 
 class Paths;
+class Settings;
 
 /**
  * To check for updates, use the `checkForUpdates` method.
@@ -16,7 +21,7 @@ class Updates
     const Paths &paths;
 
 public:
-    explicit Updates(const Paths &paths_);
+    Updates(const Paths &paths_, Settings &settings);
 
     enum Status {
         None,
@@ -59,6 +64,9 @@ private:
     QString updateGuideLink_;
 
     void setStatus_(Status status);
+
+    std::vector<std::unique_ptr<pajlada::Signals::ScopedConnection>>
+        managedConnections;
 };
 
 }  // namespace chatterino