hud's chat formatting

• Added support for FastStats (can be turned off in the config)
• Added customizable gradients with /hcf gradients (ex: &G1hello will say hello with the gradient that has the id 1)

• Added /speak and /hcf speak to send messages as a specified player also works in command blocks
• Added support to customize join/leave messages sent by supervanish plugin (https://www.spigotmc.org/resources/supervanish-be-invisible.1331/)

• Made the config more straightforward with custom join, leave, death, and advancement messages,
• added /hcf messages help for easy command usage

fixed some issues involving prefixes in custom messages

Added support for nicknames and prefixes in custom join, leave, death, and advancement messages.