Bug fixes, cleanup, misc. WorldChannels and ProximityChannels now support more than one world.

Update 1.3 brings:

• A new symbols feature. Each channel can have a defined symbol, and when a player types it before their message, it will be sent to the corresponding channel.
• Bug fixes with the /chatcolor command

Version 1.2 brings some new features and some bug fixes to Strings.

Introducing: Mentions
You can now mention any player by typing @<username> in chat.
When a player is mentioned, they'll hear a sound of your choice and a message will appear in their action bar.
Most features of mentions are customizable in the config file.

Fixes:
/reload command fixed
Channel membership issues fixed
Prefix being unchangeable fixed.

Special thanks to GitHub users:
@/cupang-afk - code contributions
@/levitskyyy - suggesting the mention system.

Update 1.1:
- Added a /chatcolor command
- Added an API. Information on the API can be found on the GitHub page.
- Added WorldChannels and ProximityChannels, among other changes with channels.
- Relaxed some requirements for the "global" channel, as players are no longer assigned to it by default.
- Small additions
- Bug fixes
NOTES:
For detailed information on channels, have a look at the wiki.
Take note of priority and membership.
This is a large update, and I've tried to do lots of testing, however, it's certainly possible something slipped through! If you find any issues please feel free to let me know.

I forgot to remove something for debugging for the initial release, this update only removes it.