Clean headers in lib qmljs and plugins qmljstools, qmljseditor.

Change-Id: I3256db8f4d42b6326d986d754b45e6c6c2030839
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/libs/qmljs/qmljsstaticanalysismessage.h

@@ -33,13 +33,16 @@
 
 #include "qmljs_global.h"
 #include "qmljsconstants.h"
-#include "parser/qmljsengine_p.h"
+#include "parser/qmljsastfwd_p.h"
 
-#include <QRegExp>
 #include <QString>
 #include <QList>
 
+QT_FORWARD_DECLARE_CLASS(QRegExp)
+
 namespace QmlJS {
+class DiagnosticMessage;
+
 namespace StaticAnalysis {
 
 enum Type