* Split Settings::Tab::Style into StyleLeftWidget and StyleRightWidget.
* Moved stuff closer to the new UI for Style settings widget.
* Fixed some code using switch-case to if-else for easier reading.
* Added setEnabled(), widget(), and toQTabWidgetIndex() to FreezableTabWidget.
* Fixed previously unknown bug in Settings::Widget connection in MainWindow::Widget.
* Set tab position to QTabWidget::South to Settings::Tab::General and Settings::Tab::StyleRightWidget.
* Removed index property from internal struct Item in Settings::WidgetWrapper. Added framed property to Item.
* Fixed some bugs in Settings::WidgetWrapper involving the index of different data.
* Added setTabPosition() to Settings::WidgetWrapper.
* Added some accessing functions to Settings::WidgetWrapper.
+ Added Writer::Widget files.