Speed up bar creation by threaded github update

[SemjonWilke]

Feature Request

Since the github module sometimes takes a while to update notifications, I suggest letting it update in a separate thread in order to avoid blocking the rest of the bar.

Solving this by providing a core framework for threaded updates may be preferred as it allows other modules to make easy use of it as well.

[tobi-wan-kenobi]

@SemjonKerner Please let me know whether this works now for you.

For future improvement, this could be used to simplify code in:

• apt
• octoprint
• pacman
• shell
• spaceapi
• title
• ping
• redshift
• vault (?)

[SemjonWilke]

It works like a charm. Thanks again for this quick fix and so delicate. Well done.