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Restart kwin wayland on failures

David Edmundson requested to merge work/restart into master

Introduce helper to restart kwin on crash exit

Right now when kwin exits, the user is taken directly back to the login screen. The login session exits, so all processes then are killed by the session.

This patchset introduces a mechanism to safely restart kwin. The socket (typically wayland-0) remains alive and persistent across restarts. This means if any process reconnects through it's own mechanism or a crash restart handler the socket appears to work, and blocks until the new kwin restarts.

This makes it secure and race free.

If the screen was locked at the time kwin went down, this is also secure. Kwin now checks the status from logind at the time of launch, so will immediately restore a locked state before any other rendering.

Move m_display construction to the constructor

We will always create one, this resolves potential to call a getter on a null object. Requires some code shuffling.

Port to kwayland server changes

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