Update 1.2! Random padlock codes and bugfixing!

Hey everyone! Hope you're doing awesome! :D

I present a nice new feature:

• All padlocks codes are randomly generated at the start of the game and assigned to the corresponding note.

This little update fixes the following bugs:

• When Alt-tabbing the game the mouse would not work. I fixed this by pausing the game whenever the window loses focus!
• When you tried to play the game after completing it, the keys would not work. I fixed this by resetting all the keys at the (re)start of the game.