A little release to fix a bug with enderchests' saving.

What's changing?

• Fix a major bug: when a player quits the server, all its data are stored in the memory and its chests do not saved correctly. This problem should no longer appear!
• Adding an option to use a global sound or a player-specific sound when a player opens/closes an enderchest.

Contact me or open an issue if you have another bug with the plugin!
Thanks.