Refactoring: TFTPFileSystem::ReadSymlink.
Refactoring: TFTPFileSystem::RenameFile.
Refactoring: const
Refactoring: static_cast
Refactoring: TTerminal::Reopen.
Sysutils.cpp: Add function finally
Refactoring: TTerminal::Reopen: Use finally.
Refactoring: Terminal.cpp: Use finally.
Refactoring: Use finally.