New command, new config option, and bug fixes.

• New /realname <nickname> command to find the name of the player the nickname belongs to.
• New config option for default username color. If a player doesn't have a nickname then the PlaceholderAPI placeholder and HexNicks will display their username colored with this default color.
• Fixed Spigot chat event firing at highest priority.
• Chat messages will now be formatted along with nicknames in chat.
• Bump ConfigUpdater to a newer, hopefully better, version.

A lot of these changes, including /realname, were made due to requests in Discord. If you have an idea for a way to improve the plugin don't hesitate to let me know here!