TabBox: Allow switchers to handle the tabbox hiding
Previously, the switcher item got hidden immediately after selecting a window, so it wasn't possible to show an exit transition. Emit instead an `aboutToHide` signal and let the switchers that opt-in to handle when to hide the tabbox by just setting its `visible` property to `false`. In the default case we handle that signal by immediately hiding the tabbox as usual. For symmetry, add also a new `aboutToShow` signal which simplifies setting an enter transition.
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mentioned in commit b8af647c
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mentioned in merge request !4064 (merged)
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mentioned in commit e0ba7b40
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