C++: change working-copy to work on UTF-8 encoded QByteArrays.

These not only take less space than UTF-16 encoded QStrings, but due to
the caching in the CppEditorSupport also take less time to build.

This patch also fixes a number of possible encoding issues, where files
and constant strings were (falsely) assumed to be UTF-8.

Change-Id: Ib6f91c9a94ebed5b5dfbd4eb2998825c62c72784
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/genericprojectmanager/genericproject.cpp

@@ -221,8 +221,11 @@ void GenericProject::parseProject(RefreshOptions options)
         m_defines.clear();
 
         QFile configFile(configFileName());
-        if (configFile.open(QFile::ReadOnly))
-            m_defines = configFile.readAll();
+        if (configFile.open(QFile::ReadOnly)) {
+            // convert from local/file encoding to UTF-8
+            QTextStream configStream(&configFile);
+            m_defines = configStream.readAll().toUtf8();
+        }
     }
 
     if (options & Files)