/info chapter tab completion

[EpicKnarvik97]

Currently, there is no tab completion for the /info (alt: /news) command's chapters. Adding this would make it easier for players with dyslexia or similar problems. It would also make getting information smoother, as players woudn't need to find a list of available info chapters, before being able to find the information they want.
Additionally, with how prominent tab completion is nowadays, players may not even try command values not provided in tab completion.

A tested possible solution can be found here: 2.x...EpicKnarvik97:Essentials:patch-1