Fixed a lot of stuff

1. Restructured code to include a state machine
2. Added proper colliders to the fire instances
3. Fire starts only when player enters the office
4. Player starts at the bottom (not right in front of the office)
5. Player can run
6. Fixed some weirdness in the tiles at the beginning of the level
7. Extended the fire extinguisher's trigger zone
8. The "Enter your office" objective bug is now fixed. The objective
changes to "Exit the building!" when the fire starts
9. Fixed the inability to climb stairs
10. Changed some build settings (like resolution)