Demo v1.1 update

Many fixes and things changes from feedback!

• Improved Green Hill background
• Improved physics (aside from with Tails flying...)
• Extended Tails ending cutscene
• Added new animations
• Removed the blood from Sonic's eyes, as it doesn't make sense for that to be there at that point in the story.
• Progress bar on the boss fight
• Other small sprite improvements

Feedback is always appreciated!