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### Problem description
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This is a trivial change which adds virtual methods to View, `onOpen()`
and `onClose()`, which are called when the view is opened or closed.
This information is already tracked inside the View, but not exposed via
the API. There is `didWindowJustOpen()` and `didWindowJustClose()`, but
these fetch and then reset the flag, so they can't be used more than
once in a frame (and are sometimes called by the frame, meaning the flag
has already been consumed by the time the View's draw callback gets
called).
The use case here is that I have a View which needs to do some work
every time it's shown.
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### Problem description
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implemented, or link to an existing issue describing it -->
Projects weren't being saved as recent when a new project was saved.
They were only added as recent when re-opening the project
### Implementation description
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I also save projects as recent when saving them (I don't make a
difference between saving existing and new projects)
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