ControllerScriptEngineBase: install console extension

This allows new scripts to use console.* functions which for example
enables easier debugging using Qt's debugging and logging tools.
See https://doc.qt.io/qt-5/qtquick-debugging.html#console-api for more information
on the console extension api.

src/controllers/scripting/legacy/controllerscriptenginelegacy.cpp

@@ -95,6 +95,8 @@ bool ControllerScriptEngineLegacy::initialize() {
         return false;
     }
 
+    m_pJSEngine->installExtensions(QJSEngine::ConsoleExtension);
+
     // Binary data is passed from the Controller as a QByteArray, which
     // QJSEngine::toScriptValue converts to an ArrayBuffer in JavaScript.
     // ArrayBuffer cannot be accessed with the [] operator in JS; it needs