Clean headers in lib qmljs and plugins qmljstools, qmljseditor.

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

src/libs/qmljs/qmljscheck.cpp

@@ -36,6 +36,7 @@
 
 #include <utils/qtcassert.h>
 
+#include <QColor>
 #include <QDir>
 
 using namespace QmlJS;