Bugfixes and tweeks

Fixed: 

• Player does not receive the help package from Vicus on second playthrough
• Fullscreen changed to borderless (hopefully will run better on FullHD screens
• Added Pause Menu (alternative to ALT+F4) to exit the game
• Added some description to quest (how to get food and wood)

Work in progress: 

• Better tutorial (movement, camp button, etc.)