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