* exwm-core.el (exwm--define-global-minor-mode):
Macro for arranging EXWM mode hooks, logging.
* exwm-background.el: Add global mode definition
(exwm-background-enable): mark obsolete
* exwm-randr.el (randr): as above
(exwm-randr-enable): as above
* exwm-systemtray.el (systemtray): as above
(exwm-systemtray-mode): as above
* exwm-xim.el (xim): as above
(exwm-xim-enable): as above
* exwm-xsettings.el (xsettings): as above
(exwm-xsettings-enable): as above
Condition defcustom setters on global mode presence.
* exwm-systemtray.el (xcb:systemtray:-ClientMessage): Remove class.
(exwm-systemtray--init): Use `xcb:icccm:-ManagerSelection' instead of
`xcb:systemtray:-ClientMessage'.
* exwm-xsettings.el (exwm-xsettings--init): Use `xcb:icccm:-ManagerSelection'
instead of `xcb:xsettings:-ClientMessage'.
Users can use this to configure system-wide themes, icons, fonts, etc.
* exwm-xsettings.el: Implement the XSETTINGS protocol (fixes
https://github.com/ch11ng/exwm/issues/876)
