GitLab

* Register routines as class-methods
* Register few variables as data_interface-friends
* Indent few lines to work correctly (abfack-indentation introduced on
  outsourcing main-loop)

* Outsource almost everything
* Encapsulate all work into two calls to objects/routines

* Outsource main-loop
* Outsource routines in main-loop (caching, printing, notifying)
* Fix syntax-fuckups and un-necessities :D

* Outsource reading from URL
* Outsource loading from json-data

* Outsource forking-routines to own module

* Add .gitignore-file

- now multiple notifications for coming/ going are getting created
- if device count changes no longer user notifications are getting created

- now can display users
- added itertools to requirements