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It's not needed and breaks the build with kf5 5.90+

See also https://github.com/KDE/kwin/commit/66352bfc87b410b1e91b819fbe9eac4515ee9823

As suggested by cmake warning

Fixes windows not updating on 5.21, and the warning
QObject::connect: No such signal KWin::EffectsHandlerImplX11::windowDamaged(KWin::EffectWindow *, QRect)

See also https://github.com/KDE/kwin/commit/0c266e760bfe5d3b4f5745b538c93fc363996981

This reverts commit b03c36d3.

It may cause KWIN_EFFECT_FACTORY_SUPPORTED_ENABLED not to embed the json metadata
which will cause plugin loading to fail.

Fixes warning

AutoMoc warning
---------------
"SRC:/src/VRMirror.cpp"
includes the moc file "VRMirror.moc", but does not contain a Q_OBJECT, Q_GADGET, Q_NAMESPACE, Q_NAMESPACE_EXPORT, K_PLUGIN_FACTORY, K_PLUGIN_FACTORY_WITH_JSON or K_PLUGIN_CLASS_WITH_JSON macro.

In some enviroments this warning may be fatal.

As recommended by https://stackoverflow.com/a/49998741

https://github.com/KDE/kwin/commit/9f2cb0ae1b6fa6a79158006714907abfac12929a

We will reimplement this when VR APIs have a better way to do this.

We get a process quit event, which notifies us that we ourselves have quit.

To keep C struct initializer syntax sugar.

For overloading virtual function. Fixes clang warning.

Comment unused functions.

TODO: race condition: Pointer tip is sometimes 0 when render_thread tries to render

TODO: For some reason we get a shutdown event when another scene app starts while we are in scene mode.