Log Message:
Update to 1.20.1:

avoid deprecated GtkStock
inhibit: fix error that spammed logs from previous commit
inhibit applet: fix rendering of icon
WidthOfScreen and HeightOfScreen implementation
fix typos in some more comments
Correct spelling mistake.
gtk 3.22: avoid deprecated gdk_screen_get_monitor functions:
don’t abort on unknown DBus signal name
avoid deprecated gdk_screen_get_width/height
avoid deprecated gdk_display_get_screen
don’t use deprecated gtk_show_uri
refresh tray icon on icon theme change
actually check the $XPROTO_REQUIRED variable’s value
statistics UI: add style class mpm-statistics
Translations update