QmlJSScriptConsole: Refactored ScriptConsole, added functionality.

The ScriptConsole is renamed to QmlJSScriptConsole. The console can be used
to evaluate expressions during a QML application debug session.
Changes:
* Console can be used even when application is not on a debug break
* The object context is the currently selected object in Inspector
* ContextMenu has a Clear option
* Multiple line expressions are supported
* Traverse Command History using up and down arrow keys

Change-Id: I4e1cd8763d60be43dbba395ead2a9a086d6bab7d
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/debugger/qml/qmlengine.h

@@ -40,6 +40,9 @@
 #include <QtNetwork/QAbstractSocket>
 
 namespace Debugger {
+
+class QmlAdapter;
+
 namespace Internal {
 
 class QmlEnginePrivate;
@@ -71,6 +74,8 @@ public:
 
     void logMessage(LogDirection direction, const QString &str);
 
+    QmlAdapter *adapter() const;
+
 public slots:
     void disconnected();