Deployment 1.0.2

- Implementation of customizable starting point
- Partial refactor of buttons implementation
- Implementation of BACK key functionality on GameScreen, PauseMenu,
MainMenu, LevelScreen
- Implementation of dialog window on exit
Revert "Deployment 1.0.2"

This reverts commit b7b999596a1ecd75d99a68ee1d1194115e608105.
Revert "Revert "Deployment 1.0.2""

This reverts commit d2f37abc0abe81afd5ebbf24368258c29ecd8708.