KeepInventory Individual

• Added new config option debug.enabled, which prints debug messages of the plugin's behaviour into the server console.

• Reduced messages with ".self" and ".other" into it's own messages.*

• Various code optimizations

• Added api-version to plugin.yml to prevent legacy mode.

*I highly suggest removing those lines in the messages.yml and use the reload command in-game / restart the server to have the new changes.