Build our Settings after our QApplication, fixes crash on startup

Thanks to @stqism for reporting the crash

This is why global static variables are evil

src/main.cpp

@@ -58,6 +58,8 @@ int main(int argc, char *argv[])
     a.setApplicationName("qTox");
     a.setOrganizationName("Tox");
 
+    Settings::getInstance(); // Build our Settings singleton as soon as QApplication is ready, not before
+
     sodium_init(); // For the auto-updater
 
 #ifdef LOG_TO_FILE

src/misc/settings.cpp

@@ -39,8 +39,10 @@ Settings::Settings() :
 
 Settings& Settings::getInstance()
 {
-    static Settings settings;
-    return settings;
+    static Settings* settings{nullptr};
+    if (!settings)
+        settings = new Settings();
+    return *settings;
 }
 
 void Settings::load()

src/widget/widget.cpp

@@ -296,7 +296,6 @@ Widget::~Widget()
 
 Widget* Widget::getInstance()
 {
-    
     if (!instance)
     {
         instance = new Widget();