Restore correct formatting

Many lines were not conformant with the project's formatting rules.
This patch should fix all formatting and whitespace issues in the code
base.
A clang-format directive was put around the connect() calls containing
SIGNALs and SLOTs whose signatures would be denormalized because of the
formatting rules.

src/gui/dbsettings/DatabaseSettingsWidget.cpp

@@ -18,8 +18,8 @@
 #include "DatabaseSettingsWidget.h"
 #include "core/Database.h"
 
-#include <QWidget>
 #include <QTimer>
+#include <QWidget>
 
 DatabaseSettingsWidget::DatabaseSettingsWidget(QWidget* parent)
     : SettingsWidget(parent)