sxhkd: Change chain mode exiting

Changed the way to exit sxhkd chain modes. Instead of using `esc` to get
out of them, now pressing the mode key chain again will also exit out of
the mode (e.g. `alt + m` to get into `media` mode, then `alt + m` once
more to exit it).

This is done since using escape will interfere with many normal-use
scenarios while in a chain-mode, especially if those modes are intended
to be used over somewhat longer periods of time (somewhat like vim-modes
or emacs layers). The key to exit modes has now been moved to `copyright`,
so in the rather improbable case that your keyboard contains a
`copyright` key, be careful of accidentally hitting it when in an sxhkd
chain mode.

Fixed passing arguments to the sxhkd-piped script. It will pass along
any commandline arguments passed now (even `-s`, though then the script
will cease to do anything).

Improved version output of sxhkd-chain-labels a little, invoking
`sxhkd-chain-labels -v` will now show the correct configuration file and
FIFO pipe being used, as well as whether they exist on the file system.
Fixed the versioning of the script to display the correct version.

X/.config/xresources/xinitrc

@@ -37,7 +37,9 @@ type unclutter >/dev/null 2>&1 && unclutter &
 type picom >/dev/null 2>&1 && picom &
 
 # if sxhkd - the key-binding daemon is installed, start it up
-type sxhkd >/dev/null 2>&1 && sxhkd-piped &
+# set it to start up a custom fifo-creating version
+# and set the chain-mode exiting key to a non existing one (default would be escape)
+type sxhkd >/dev/null 2>&1 && sxhkd-piped -a "copyright" &
 
 # if nextcloud-client exists, start it up
 type nextcloud >/dev/null 2>&1 && nextcloud --background &