3D FPS project tutorial

Credit to MSU for assets, and Unity for textures and enemy AI

Plans for change: 

- add original art for particles

- have an enemy that fights other enemies and finally the player in boss fight

- make robot lights dispense particles and / or lighting 

- finish diversifying level 2 from level 1

(I will probably do 3 of these, not sure which ones yet if that's okay!)