Use Playereyelocation rather then a temporary arrow
Add Game and Player for cast at Location
Add cast on Location
Fix NullPointer when no Spells are set
Fix Item NullPointer
Add Mana System, still need a way to display it
Display Mana in Scoreboard when sneaking

Maybe needs a better way to display
Add Manacost to Customitems

Signed-off-by: Andre Schweiger <andre.spiele@yahoo.de>
Update Manadisplay on change

Signed-off-by: Andre Schweiger <andre.spiele@yahoo.de>