Add BotCommandsMessages and PermissionLocalization

[freya022]

DefaultMessages and DefaultMessagesFactory are deprecated in favor of:

• BotCommandsMessages for the messages used by the framework
• PermissionLocalization for DefaultMessage#getPermission

Deprecation process

If a non-default configuration of DefaultMessages is detected, the auto-configured BotCommandsMessagesFactory instance will delegate to it instead, and a warn will be logged.

Differences

BotCommandsMessages is similar to DefaultMessages, however:

• The template keys have been changed as to allow nesting in some cases
• Each method returns a MessageCreateData instead of a String, allowing you to fully customize the responses (such as by using Components V2 👀)
• The method names were shortened

The default strings were unchanged.

Migration process

If you made DefaultMessages[language].json files, you will need to replace DefaultMessages by BotCommandsMessages, then migrate the keys to the new ones found in BotCommandsMessages-default.json.