Added get players list functions

[Dashboy1998]

Context

• Moved player list to it's own function
• Staging for Implement CLI for RCON commands #401

Choices

• Possibly used later on for logging when players join and leave

Test instructions

1. Test that auto update works with players
2. Test that auto update works without players
3. Test that auto reboot works with players
4. Test that auto reboot works without players

Checklist before requesting a review

• I have performed a self-review of my code
• I've added documentation about this change to the README.
• I've not introduced breaking changes.