QtcProcess: Limit the inclusion of qtcprocess.h

Move the rest of QtcProcess enums to processenums.h.
Move ExitCodeInterpreter into processenums.h.
Remove superfluous Utils:: prefix.

Change-Id: Iaa596f353d33d6930085a621b114cc15a35caa80
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/libs/utils/shellcommand.h

@@ -27,7 +27,10 @@
 
 #include "utils_global.h"
 
-#include "qtcprocess.h"
+#include "filepath.h"
+#include "processenums.h"
+
+#include <QObject>
 
 QT_BEGIN_NAMESPACE
 class QMutex;
@@ -36,10 +39,15 @@ template <typename T>
 class QFutureInterface;
 template <typename T>
 class QFuture;
+class QTextCodec;
 QT_END_NAMESPACE
 
 namespace Utils {
 
+class CommandLine;
+class Environment;
+class QtcProcess;
+
 namespace Internal { class ShellCommandPrivate; }
 
 class QTCREATOR_UTILS_EXPORT ProgressParser