QmlProfiler: Rename TracePlugin to QmlProfileTraceClient

Also move it into it's own file.

Change-Id: If063b0a4c6642b1e209e6a0026fedffd01603eb9
Reviewed-on: http://codereview.qt.nokia.com/841
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qmlprofiler/qmlprofilertool.cpp

@@ -82,6 +82,7 @@
 
 using namespace Analyzer;
 using namespace QmlProfiler::Internal;
+using namespace QmlJsDebugClient;
 
 class QmlProfilerTool::QmlProfilerToolPrivate
 {