Valgrind: Merge MemCheckRunner and ValgrindRunner base

It's mostly the xml/log handling, which can be re-used in other tools.

The change is purely mechanical, including some style fixes and
some modernization.

Change-Id: I6b44ae71451e8d3e26df40b9af9b4ec70038a92d
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/valgrind/memcheckengine.h

@@ -28,7 +28,7 @@
 
 #include "valgrindengine.h"
 
-#include "memcheck/memcheckrunner.h"
+#include "valgrindrunner.h"
 #include "xmlprotocol/threadedparser.h"
 
 namespace Valgrind {
@@ -61,7 +61,7 @@ private:
     void appendLog(const QByteArray &data);
 
     XmlProtocol::ThreadedParser m_parser;
-    Memcheck::MemcheckRunner m_runner;
+    ValgrindRunner m_runner;
     const bool m_withGdb;
 };