[Open Assets] Emerald Quest 2.0

- Removed Metal Sonic from the final boss fight to make it easier
- Gave Brak Eggman 25 hit points to make the fight longer than one minute
- Fixed an untagged death pit in Flaming Forest 1
- Added animals to the final area of Death Egg Zone 2
- A reward is now given for beating Flooded City 2
- Made the Zoom Tubes in Dusk Desert 1 look nicer
- Gave the Horizon Effect to the Shadow Fortress skybox