New event handler hook.  Allows you to register commands etc from Features.
Forgot to register it to be fired
Merge pull request #1 from Mc-Immersion/New-State---Server-Starting

New event handler hook. -Completed-
Work on block/item registry
Registry
More work on registry for items/blocks
More work (I work at different pc's, hense why so many commits)
Merge branch 'Block-Registry' into Core-Blocks-+-World-Gen-Feature