Tweaks and fixes

Some improvement before adding new stuff.

• Lives/shots reduced to 3
• Nurse now walks much faster
• The nurse is now holding syringes backward
• Nurse better positioned when stabbing in a toilet stall
• Fixed typo in remaining shots "1 shot left"
• Lowered music volume in the kitchen, also cut the intro
• Improved the nurse's collision with cabinet doors so she doesn't get stuck anymore
• Doors shouldn't close at all as long as the nurse is near them (this would cause many secondary issues)
• Fixed some navmesh issues (notably in the showers area)