Integrate library into example scripts.

- example scripts are now standalone.
- consistency enforced via test

example_scripts/screenshot_script

@@ -10,7 +10,20 @@
 # Example:
 # screenshot_script "gwenview"
 
-source "$(dirname "${BASH_SOURCE[0]}")/cb_script_header.sh"
+named_pipe_send="$(mktemp -u)"
+named_pipe_recv="$(mktemp -u)"
+mkfifo "${named_pipe_send}"
+mkfifo "${named_pipe_recv}"
+nc -U "${CAGEBREAK_SOCKET}" < "${named_pipe_send}" > "${named_pipe_recv}"&
+# The file descriptor 3 is set up to send commands to cagebreak and file
+# descriptor 4 can be used to read events. Notice that events will pile up in
+# file descriptor 4, so it is a good idea to continuously read from it or to
+# clear it before starting a new transaction.
+exec 3>"${named_pipe_send}"
+exec 4<"${named_pipe_recv}"
+# When the script exits, the os will clean up the pipe
+rm "${named_pipe_recv}"
+rm "${named_pipe_send}"
 
 if [[ ${#} -lt 1 ]]
 then