Toxic gossip train

Adds four simple things:
– Ukulele, Colleen’s ukulele that spawns in all forest variants, drops Ukulele strings when killed
– Ukulele strings, dropped by the Ukulele mob that is used to craft a new weapon
– Weapon recipe, use 9 guitar strings to craft a new weapon
– Colleen Ballinger, new weapon that deals 10 damage and has 1.6 attack speed crafted with 9 guitar strings