This is preparation work for supporting ConnectToEIS. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2628>
To be enabled with MUTTER_DEBUG=eis Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2628>
This adds support for EIS clients in the form of MetaEis and MetaEisClient. The purpose is to allow clients to connect and send emulated input events using EIS. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2628>