VCS: Show message box on timeouts/Add SSH prompt.
- Use message boxes on timeouts. - Add a configuration for a graphical SSH password prompt binary with defaults - Launch commands that require authentification with no terminal on UNIX and environment variable SSH_ASKPASS set accordingly. - First attempt at introduce a common function to synchronously run VCS commands in base plugin with flags. - Use standard execution log entries in all VCS plugins (outputwindow).
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