Allow to explicitly trigger a segfault in the dev mode page

Useful for testing crash handling.

src/app/DevelopmentModePage.qml

@@ -55,5 +55,11 @@ Kirigami.ScrollablePage {
             Layout.fillWidth: true
             onClicked: DevelopmentModeController.enablePublicTransportLogging();
         }
+
+        QQC2.Button {
+            text: "Crash"
+            Layout.fillWidth: true
+            onClicked: DevelopmentModeController.crash();
+        }
     }
 }

src/app/developmentmodecontroller.cpp

@@ -23,6 +23,8 @@ using namespace KAndroidExtras;
 #include <QtAndroid>
 #endif
 
+#include <csignal>
+
 void DevelopmentModeController::enablePublicTransportLogging()
 {
 #ifdef Q_OS_ANDROID
@@ -84,3 +86,8 @@ void DevelopmentModeController::clearOsmTileCache()
     }
     QDir(base + QLatin1String("/17")).removeRecursively();
 }
+
+void DevelopmentModeController::crash()
+{
+    std::raise(SIGSEGV);
+}

src/app/developmentmodecontroller.h

@@ -19,6 +19,7 @@ public:
     Q_INVOKABLE void importMapCSS(const QUrl &url);
     Q_INVOKABLE void purgeMapCSS();
     Q_INVOKABLE void clearOsmTileCache();
+    Q_INVOKABLE void crash();
 };
 
 Q_DECLARE_METATYPE(DevelopmentModeController)