Alpha 160

• Added a "duplicate tab" hotkey (by @Me1onRind) #4775
• Added more timeout options for the Vault password (by Aaron Davison) #4779
• Made environment var overriding case insensitive on Windows
• Allowed variable substitution for env vars (e.g. PATH = $PATH:/opt/...)
• SSH: Fixed X11 port detection for UNIX sockets
• SSH: Allowed overriding X11 display (Settings -> SSH)