Implemented file rename in ResourceEditor.

Renaming supports version control.

To prevent code duplication part of ProjectExplorerPlugin::renameFile
implementation was separated into FileUtils::renameFile.

Change-Id: I28481bea89d0824339e5db025ceb7216713bd5a0
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/coreplugin/fileutils.h

@@ -49,6 +49,8 @@ struct CORE_EXPORT FileUtils
     // Platform-dependent action descriptions
     static QString msgGraphicalShellAction();
     static QString msgTerminalAction();
+    // File rename aware of version control and file system case-insensitiveness
+    static bool renameFile(const QString &from, const QString &to);
 };
 
 } // namespace Core