Replaces awful connect type system with bitflags
Slime Fix
- Adds missing slime sprites, eliminating the infamous invisible slime bug.
- Added sprites are taken from tgstation's code, and correspond with wiki entry.
Merge pull request #7514 from atlantiscze/slime-fix

Slime Fix
Merge pull request #7510 from Zuhayr/mutantrace

Gibber fixes/refactor, mutantrace refactor, couple of small fixes.
Merge pull request #7519 from Baystation12/master

Interbranch merge
Merge pull request #7516 from mwerezak/pipecleaner

Replaces connect type system
merge