use libxkbcommon-x11 instead of libX11
little cleanups thanks to Ran Benita’s review
listen for XKB events instead of the MappingNotify event (Thanks Ran)
remove obsolete xkb_state_update_key() calls (Thanks Ran)
update the changelog/readme for 2.6
Die when the X11 connection breaks during runtime (Thanks Eduan)
implemented logging the number of failed attempts

This closes #1243
clock: initial code by L29Ah
Add foreground color option; refactor color parsing
Add forgot long option fgcolor
clock: make this optional
+ frame around the clock
a bit more consistent visual and coding style
Make clock tick
help message updated
updated the man page