Menu hides when hovering over menu item after hovering over submenu

[Moerliy]

Is there a reason why the menu would close after a second?

This PR isn't the solution, but I just wanted to get the ball rolling on this.

Added a setting to change the auto-close behavior.

Will increase the 1-second timeout to 2 seconds:

<VDropdown :autoCloseTimeout="2000">
...
</VDropdown>

Will disable the auto-close behavior completely:

<VDropdown :autoCloseTimeout="0">
...
</VDropdown>

Closes #916

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