Dual-mode dVPN (windows) Release dual-mode helper service for beta test

[Zensey]

• [x] Release a binary
• [x] Write installation manual
• [x] Evaluate how connection sharing works, especially with Wifi adapters, as it's known there're some issues.
• [x] Write a trouble-shooting guide
• [x] Prep. questions for manual testing
• [x] Form a report automatically to help with reporting of test result
• [x] VM image updater for dual-mode helper
• [x] Add daemon-supervise to respawn myst service