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
<!-- Describe the bug that you fixed/feature request that you
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
<!-- Explain what you did to correct the problem -->
I also save projects as recent when saving them (I don't make a
difference between saving existing and new projects)
### Screenshots
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make before/after sceenshots -->
### Additional things
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Adds keyboard shortcuts (currently `n` and `N`) in the diffing plugin
view to jump to the next/prev difference in the list.
IMPORTANT NOTE: Depends on changes made in a library submodule. [This
PR](https://github.com/WerWolv/libwolv/pull/34) must be accepted first.
---------
Co-authored-by: Nik <werwolv98@gmail.com>
