Automatically try to reconnect

BetterEnderChest tries to reconnect. If the reconnect fails, saving and
loading of chests will be disabled, so BetterEnderChest won't try to
reconnect again. You can type /bec reload to retry.
Print the error again in the console when using commands

Server admins were missing the save and load errors. so a few weeks back
I added a feature that reprints the error to the console when a player
opens a chest. This feature now works too when using the commands to
open the chests.
Fix NPE in MySQLUUIDConverter when connection failed

BEC will now startup up again correctly, allowing you to do /bec reload
after the database connection problem is fixed.
Update version to 2.2.2