menus, particles, enemies, a new boss

added some new stuff, menus, niagara unreal particles, open space stuff, some new enemies to singleplayer to make it a bit more manageable, also a nice boss fight with a progress bar above boss:

https://youtu.be/b_MaNUUYZDY

https://youtu.be/R7RiixZ2Yjo

https://youtu.be/AlWFnkE1Nws

https://youtu.be/xMK50XCe_Uc

https://youtu.be/LvtWdR9QbJM