VipShuffle 1.6.0

| Changelogs v.1.6.0
- BasePlayer.ActivePlayerList.ToList() is now used to create a copy of the player list.

- The excluded groups are cached in a HashSet<string> at server startup.

- Added error handling for the VIP command.

- String interpolation ($“”) is now used throughout.

- nameof() is used for the authorization constant.

Overall, the code is now:

- Better performance: using ToList() creates a copy of the player list, preventing issues with concurrent changes.

- More efficient group management: By caching the excluded groups in a HashSet, repeated configuration calls are reduced.

- More robust error handling: Error handling for the VIP command has been added, which increases the stability of the plugin.

- Improved readability: By using string interpolation and nameof(), the code is easier to read and maintain.

- Slightly optimized performance: The use of LINQ methods in IsEligiblePlayer can lead to a slight performance improvement in certain scenarios.