Flappy Dunk: Slam Dunk Contest

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Minor bug fixes
New achievements rules:
- Unlock Bronze medal achievement at 10 points --> you get 5 free coins (equivalent to one new life)
- Unlock Silver medal achievement at 30 points --> you get 10 free coins (equivalent to two new lives)
- Unlock 50 coin achievement by collecting 50 coins --> you get another 15 free coins (equivalent to three new lives)
- Unlock Gold medal achievement at 100 points --> you get 30 free coins (equivalent to six new lives)