V9.28.4

1. [SSH] Optimize the representation of SSH multi-layer Jump server crossing.
2. [SSH] Add functions for SSH tunneling, including port mapping and SOCK4/5 proxy.
3. [SFTP] Function optimization to fix the defect of failed deletion of local folders.
4. [SFTP] Function optimization, adding column sorting function and numerical friendliness display optimization.
5. [SFTP] Function optimization to increase display transmission speed.
6. [Administrator] Add multiple special function switches.
7. [Administrator] Add the switch for tunnel guard mode.