QmlJS: Remove 'qmljsprivateapi.h' header

That's a reminiscent of the times when qmljs was just a copy
of the classes in Qt.

Rather include the files individually.

Change-Id: I6ff8541c004ef4dab9d9d4f5011ff6c5a3a0574a
Reviewed-by: Aurindam Jana <aurindam.jana@nokia.com>

src/plugins/qmljsinspector/qmljsclientproxy.h

@@ -33,7 +33,7 @@
 #define QMLJSCLIENTPROXY_H
 
 #include "qmljsinspectorplugin.h"
-#include "qmljsprivateapi.h"
+#include <qmldebug/baseenginedebugclient.h>
 #include <QObject>
 
 QT_FORWARD_DECLARE_CLASS(QUrl)
@@ -53,6 +53,8 @@ namespace Internal {
 class InspectorPlugin;
 class QmlToolsClient;
 
+using namespace QmlDebug;
+
 class ClientProxy : public QObject
 {
     Q_OBJECT