Hell Pages Jukebox and some finetuning

Dear friends,

The biggest news in this update is the inclusion of the Hell Pages Jukebox. You can access it through the "Soundtrack" option on the main menu. Then you'll be able to listen to all music tracks contained in Hell Pages original soundtrack.

Besides that, there were some other adjustments:

- Bael, the main character, now has a little blinking red area, which shows his hitbox.

- When pressing "ESC" to pause game, now you can choose between exit to main menu ou return to gameplay.

- The "hand" controlling with keyboard and gamepad on the main menu and select areas is smoother now, as the "hand" speed has been reduced. There's no change when using mouse, though.

- When pressing the "F" key, you can toggle between fullscreen and windowed mode on any part of the game.

- When playing in "Easy", now you'll be able to collect, on every single stage, little flasks that restore automatically all your energy and magic.