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/AboutDialog.cpp

@@ -64,10 +64,9 @@ AboutDialog::AboutDialog(QWidget* parent)
     debugInfo.append(tr("Distribution: %1").arg(KEEPASSXC_DIST_TYPE).append("\n"));
 #endif
 
-    debugInfo.append("\n").append(QString("%1\n- Qt %2\n- %3\n\n")
-                                      .arg(tr("Libraries:"),
-                                           QString::fromLocal8Bit(qVersion()),
-                                           Crypto::backendVersion()));
+    debugInfo.append("\n").append(
+        QString("%1\n- Qt %2\n- %3\n\n")
+            .arg(tr("Libraries:"), QString::fromLocal8Bit(qVersion()), Crypto::backendVersion()));
 
 #if QT_VERSION >= QT_VERSION_CHECK(5, 4, 0)
     debugInfo.append(tr("Operating system: %1\nCPU architecture: %2\nKernel: %3 %4")