More improvements to Chapter 3!

Additions

- Generators can combust and kill you!

-New Hospital beds (seen in chapter 3 part 1)

-Massive improvements with the level design of chapter 3 part 1

- New sounds and ambience done by Startair!

-Games welcoming intro is now faster and simpler

- Chapter 3 part 3 is now added 

-Small changes to Chapter 1 part 4 (mostly added generators and health kits)