Falldown v1.4

Changelog

• Added (randomized) cloud background images
• Added parallax scrolling for the background (background image and clouds)
• Added an option to deactivate the background image
• Added a (random) cloud scale factor for cloud variations
• Added a scrolling level as background (when not in-game) 
• Added specific loading texts in loading screen
• Added a very (VERY) high limit of steps that the player can fall down. Should never be reached even closeley, but better save than sorry.
• General bug fixing, cleaning up and refactoring