Refactoring changes: Cleanup and improvements.
Previously RefactoringFiles were usually passed around by value. However, since a RefactoringFile may sometimes own a QTextDocument (when it was read from a file), that's not great and caused the file to be reread after every copy. With this change RefactoringFile becomes noncopyable and is always owned by a shared pointer. This change also allowed having const RefactoringFiles which is useful because they can be safely used from other threads. See CppRefactoringChanges::fileNoEditor. Change-Id: I9045921d6d0f6349f9558ff2a3d8317ea172193b Reviewed-on: http://codereview.qt.nokia.com/3084 Reviewed-by: Leandro T. C. Melo <firstname.lastname@example.org>