Initialize WindowHelper before the eventloop starts

This closes #161 but I honestly don't know why.

With this applied, the render loop on iOS stops when there are no updates so it should improve battery life considerably.

app/main.cpp

@@ -80,8 +80,8 @@ int main(int argc, char* argv[]) {
     engine.addImportPath(QStringLiteral("../modules"));
 
     // Initialize UI helpers and fonts
-    WindowHelper::instance();
     Settings::instance();
+    WindowHelper::instance();  // Needs to happen after Settings
     Lith::instance();
     auto fontFamilyFromSettings = Lith::settingsGet()->baseFontFamilyGet();
 #if defined(Q_OS_IOS) || defined(Q_OS_MACOS)

modules/Lith/Core/windowhelper.cpp

@@ -20,14 +20,13 @@ WindowHelper::WindowHelper()
     m_changeSchemeTimer->setInterval(50);
     m_changeSchemeTimer->setSingleShot(true);
     connect(m_changeSchemeTimer, &QTimer::timeout, this, &WindowHelper::changeScheme);
-
-    QTimer::singleShot(0, this, &WindowHelper::init);
 }
 
 WindowHelper* WindowHelper::instance() {
     static WindowHelper* self = nullptr;
     if (!self) {
         self = new WindowHelper();
+        self->init();
     }
     return self;
 }