Expanding top validation to all towers.
Creating the initial screen to put the options menu
Attempts to enter the game through buttons.
Fixing conflicts.
Fixing bug by moving an disc to itself tower. Changed comparisons to strictly equal to vanish alerts.
Inserting code to check for levels of the game.
Modularizing validation of discs.
Fixing incorrect syntax.
Merge branch 'master' into refactoring_moviments
Expanding validation to other towers. Clean code.
Finalizing code refactoring. Removing duplicated code.