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).

src/plugins/vcsbase/commonvcssettings.h

@@ -51,6 +51,9 @@ struct CommonVcsSettings
 
     QString submitMessageCheckScript;
 
+    // Executable run to graphically prompt for a SSH-password.
+    QString sshPasswordPrompt;
+
     bool lineWrap;
     int lineWrapWidth;