Freeze

Lots of changes in code. (Thanks a lot to aumgn for his help !)

Add /rldfreeze command and world argument in /freezeall command.

Add /freezelist command.

Add message option.

Seconds arguments for /tmpfreeze can now be seconds or "like-Essentials" time format (3d4h5m3s for 3 days 4 hours 5 minutes and 3 seconds)

Temporarily freeze time is also save with freezed players when the server reboot or is reloaded. (when save option is enabled)

Bug fixed when you give freeze.tmpfreeze node without freeze.freeze node.