Space Suits, Upgrades, Oxygen

Changes

added all the spacesuit stuff and oxygen handling cleaned up ai stuff a bit moved structures to static and made it simpler to get structures

[ ] I have fully tested the proposed changes and promise that they will not break world generation, mob spawning, and the like.
[ ] I followed the existing code standards and didn't mess up the formatting.
[ ] I did my best to add documentation to any public classes or methods I added.
[ ] I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values