[Usability] Panels autohide setting

[<emmfamlame-001 yahoo com br>]

 It would be nice if there would be added the following options
on  Propertis  (acessed by left-clickin one panel):

  - autohide     hide time   999 ms
  - autohide    show time   999 ms
  - autohide  hidden size    999 pixels



I think many people would like this too.
(I myself rather it to hide and show faster, and when hidden to be litller)

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