Stealth v0.2

Changed some mechanics of the enemies so that you can't be spotted while going through doors

Edited Level 3 to introduce the idea that you can hide right below a camera to the player, making it easier to grasp new ideas

Changed the pause buttons so that 'Esc' doesn't pause and go to the menu (which results in you needing to restart the game), only 'P' to pause and 'Esc' to go to the menu