ScriptConsole: Refactor to QtMessageLogWindow

Move QML/JS independent classes to common Debugger
code. A Debugger Engine needs to override
evaluateScriptExpression() to provide engine
specific script evaluation.

Change-Id: I02b23b380a3eb1b12003b30ded0b7d075e44dfed
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/qml/qmlcppengine.h

@@ -96,6 +96,8 @@ public:
         int timeout = -1) const;
     void resetLocation();
 
+    Internal::QtMessageLogHandler *qtMessageLogHandler() const;
+
 protected:
     void detachDebugger();
     void executeStep();
@@ -112,6 +114,7 @@ protected:
     void executeRunToFunction(const QString &functionName);
     void executeJumpToLine(const ContextData &data);
     void executeDebuggerCommand(const QString &command);
+    bool evaluateScriptExpression(const QString &expression);
 
     void setupEngine();
     void setupInferior();