Carpet LAB Addition

Carpet features created for the LAB SMP, as we need them. Currently only contains features for Scarpet.

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Scarpet events:

__on_player_message_broadcast(player, message)

• Triggers right before a player message is broadcast to the server.
• Can be cancelled by returning 'cancel', which prevents the message from being sent.
• Useful for making changes to chats before they're sent.

__on_player_edits_sign(player, block)

• Fires after a player edits a sign, after the vanilla text changes take place.
• Can be used to add custom sign formatting.
• Example script

Scarpet functions:

encode_snbt(expr, force?)

• Essentially the same as encode_nbt(expr, force?), except it allows heterogeneous lists
• This is done to bring it in line with vanilla's new NBT format