Pop Gun: a Brick Breaker game

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- Added settings menu in main menu
- Added exit from level selection menu
- Added marker of passed levels in level selection menu
- Added Sophie's Auto Acceleration System
- Added Pot Tutorial
- Merchant now opens when level 2 is opened
- Added comic book system and a comic book before the tutorial
- Added explosive mobe blast
- Fixed visual bugs in the store
- Fixed bug with worn skins in the locker
- Fixed bug with opening more levels