0.19

• Update to xcb-proto 1.17.0
• Implement float & double types
• Handle elements in XCB specs
• Rename cb:xsettings:-ClientMessage -> xcb:icccm:-ManagerSelection
• Fix lint errors (deprecation warnings etc)
• Rename el_client.el -> xelb-gen
• Add xcb-xsettings.el
• Drop compatibility code for old Emacs versions. Depend on 27.1
• Updated repository URL to https://github.com/emacs-exwm/xelb
• New maintainers: Adrián Medraño Calvo, Steven Allen, Daniel Mendler