Add new items to item pools

[ryondinkus]

Resolves #108

Current Item Pools:

Treasure:

• Duke's Gullet
• The Princes
• Queen Fly
• Super Infestation
• Lil Duke
• Sharty McFly
• Duke of Eyes
• The Invader

Curse:

• Fiendish Swarm
• Rotten Gullet
• Lil Husk

Secret:

• Duke Flute
• Ultra Heart Fly
• Duke of Eyes

Devil:

• Fiendish Swarm

• Lil Duke

• Rotten Gullet

• Lil Husk

• The Invader

• Red Chest:

• Lil Husk

Devil Beggar:

• Fiendish Swarm
• Rotten Gullet

Key Master:

• Fiendish Swarm
• The Princes
• Queen Fly
• Sharty McFly
• Ultra Heart Fly

Ultra Secret Room:

• Super Infestation
• The Invader

Crane Game:

• Duke's Gullet
• Queen Fly
• Super Infestation
• Ultra Heart Fly
• Rotten Gullet

Baby Shop:

• Lil Duke
• Sharty McFly
• Lil Husk
• The Invader

Greed Treasure:

• Duke's Gullet
• The Princes
• Queen Fly
• Super Infestation
• Lil Duke
• Sharty McFly
• Duke of Eyes
• The Invader

Greed Shop:

• Duke's Gullet
• The Princes
• Sharty McFly

Greed Curse:

• Fiendish Swarm
• Rotten Gullet
• Lil Husk

Greed Secret:

• Duke Flute
• Ultra Heart Fly
• Duke of Eyes

Greed Devil:

• Fiendish Swarm
• Lil Duke
• Rotten Gullet
• Lil Husk
• The Invader