Include a new xdg_activation protocol

Merged Aleix Pol requested to merge apol/wayland-protocols:xdg-activation into main

Here's some implementations of the protocol:

Here's a test application:

The master branch is an application that depends on my Qt patch above. There's a qt5 branch that can be built against a normal Qt 5 build.

Approving reviews:

Edited by Simon Ser

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