Adding Reset Save Functionality, Timer, and others

Hello, in this update, the timer and the reset save !

Update: 

- Reset Save Functionality: Added a button to the main menu to reset your progress. The addition of this was necessary because the more the updates progress, the more possible strange saves appear due to the change of place of the puzzles, to new features, ...

- Timer : A timer is now visible during puzzles. For the moment it is purely ethical but it will be used to add challenge to puzzles, will be displayed in the puzzle selection, ... With this one, at the start of a puzzle there is now a small starting animation.

- Change of icons in game for more clarity

- The delays of some animations have been modified to avoid waiting too long (example: end of puzzle animation, movement in the puzzle selection, ...)

- Fixed multiple bugs: the end popup was not displayed in some cases, the Restart feature could cause problems in the completion of a puzzle, a non-black frame was visible at game launch, ...

Thanks for reading!