Utils: Add a CommandLine::splitArguments() convenience function

... and use it from within new SynchronousProcess functions
taking CommandLine arguments.

Change-Id: I5d7f83727cbb22f03b1a79b1645db95514c66033
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/utils/fileutils.cpp

@@ -95,6 +95,11 @@ QString CommandLine::toUserOutput() const
     return m_executable.toUserOutput() + ' ' + m_arguments;
 }
 
+QStringList CommandLine::splitArguments(OsType osType) const
+{
+    return QtcProcess::splitArgs(m_arguments, osType);
+}
+
 /*! \class Utils::FileUtils
 
   \brief The FileUtils class contains file and directory related convenience