Emulated Input client library - installed tests

 libei is a library for Emulated Input, primarily aimed at the Wayland
 stack. It provides three parts:
  - EI (Emulated Input) for the client side (libei)
  - EIS (Emulated Input Server) for the server side (libeis)
  - oeffis for D-Bus communication with the XDG RemoteDesktop portal
 .
 This package includes tests to be used on the installed system.