Rework CollisionGroups (#7656)

* Replace Mob, Vault, and Small impassable with Mid, High, Low

* Remove CollisionGroup.Underplating

* Remove CollisionGroup.Passable

* Fix constructed APCs not being interactable

* Change firelocks to occlude

* Make pipe inherit from BaseItem

* Clean up pipes

* Remove duplicate physics and fixtures from bucket

* Rework CollisionGroups on all entities

* Add SlipLayer

* Remove fixture from delta

* Fix maps

* Address reviews

* Add SubfloorMask

* Fix glass collisions for flying mobs

* Fix maps

* Update new items

* Fix bagel again

* Fix slug

* Fix maps

* Touchups

* Fix tables blocking high pressure movement

* Update StandingState to allow going under flaps

* Cleanup

* More formatting

Content.Server/AI/Pathfinding/PathfindingSystem.cs

@@ -48,9 +48,9 @@ namespace Content.Server.AI.Pathfinding
 
         public const int TrackedCollisionLayers = (int)
             (CollisionGroup.Impassable |
-             CollisionGroup.MobImpassable |
-             CollisionGroup.SmallImpassable |
-             CollisionGroup.VaultImpassable);
+             CollisionGroup.MidImpassable |
+             CollisionGroup.LowImpassable |
+             CollisionGroup.HighImpassable);
 
         /// <summary>
         /// Ask for the pathfinder to gimme somethin