fix some crashes, mostly related to network requests (#6187)

src/Application.hpp

@@ -139,7 +139,8 @@ public:
 
     void initialize(Settings &settings, const Paths &paths);
     void load();
-    void save();
+    void aboutToQuit();
+    void stop();
 
     int run();
 
@@ -148,7 +149,7 @@ public:
 private:
     std::unique_ptr<Theme> themes;
     std::unique_ptr<Fonts> fonts;
-    const std::unique_ptr<Logging> logging;
+    std::unique_ptr<Logging> logging;
     std::unique_ptr<Emotes> emotes;
     std::unique_ptr<AccountController> accounts;
     std::unique_ptr<eventsub::IController> eventSub;
@@ -246,4 +247,6 @@ IApplication *getApp();
 /// Might return `nullptr` if the app is being destroyed
 IApplication *tryGetApp();
 
+bool isAppAboutToQuit();
+
 }  // namespace chatterino