Fix client config not registered exception #7

Add freeze entity commands:

/timeclock freeze list - View the freezelist

/timeclock freeze list <true/false> - Same as above, but choose whether to output to the log

/timeclock freeze clear - Remove all entities in the freezelist

/timeclock freeze remove <target> - Remove the target from the freezelist

/timeclock freeze remove uuid <UUID> - Remove the UUID from the freezelist.

/timeclock freeze add <target> - Add the target to the freezelist.