- Added command argument "list" (ki.admin.cmd.list) to get a list of players who have KeepInventory enabled.

- Added command argument "help" (ki.admin.cmd.help) to get a list of commands for this plugin.

- Added permission node "ki.keepxp" (default to op players) to prevent players from losing their experience levels upon death.

- Various code optimizations were done for better plugin performance.