Sessions tab should fly out automatically

[larsen0815]

"Sessions" tab should fly out automatically when moving the mouse over it instead of having to click on it, just like in SuperPuTTY.
It'd probably be best to make this configurable.

[SilverGreen93]

I didn't find the need myself for it, but I can understand the request. I upgraded to a newer DockPanelSuite to make it more modern and to implement Dark Mode, but it might lack the ability to detect mouse hover events. I will take a look if it can be implemented easily, but it does not seem like it.