Huge gameplay/general update

Lightning strike when hammer spawns
Knockback show potions effects
When stunned no item pickup
Hammer now drops and doesn't get added into the inventory
Stun is now 1 second longer
Added all extra messages to messages.yml
Instead of breaking blocks you now have to jump under the noteblocks (mario style)
Noteblocks drop 1-2 gold ingots now
You only win by getting 50 gold now, not by breaking noteblocks
Hammer guy doesn't do that much damage anymore, but more stun and his knockback range was increased
Fixed the Scoreboard
Fixed killed players sometimes dropping second hammer
Fixed players not getting the slowness potioneffects removed after losing hammer
Adds sounds when jumping