Physics (#3452)

* Content side new physics structure

* BroadPhase outline done

* But we need to fix WorldAABB

* Fix static pvs AABB

* Fix import

* Rando fixes

* B is for balloon

* Change human mob hitbox to circle

* Decent movement

* Start adding friction to player controller

I think it's the best way to go about it to keep other objects somewhat consistent for physics.

* This baby can fit so many physics bugs in it.

* Slight mob mover optimisations.

* Player mover kinda works okay.

* Beginnings of testbed

* More testbed

* Circlestack bed

* Namespaces

* BB fixes

* Pull WorldAABB

* Joint pulling

* Semi-decent movement I guess.

* Pulling better

* Bullet controller + old movement

* im too dumb for this shit

* Use kinematic mob controller again

It's probably for the best TBH

* Stashed shitcode

* Remove SlipController

* In which movement code is entirely refactored

* Singularity fix

* Fix ApplyLinearImpulse

* MoveRelay fix

* Fix door collisions

* Disable subfloor collisions

Saves on broadphase a fair bit

* Re-implement ClimbController

* Zumzum's pressure

* Laggy item throwing

* Minor atmos change

* Some caching

* Optimise controllers

* Optimise CollideWith to hell and back

* Re-do throwing and tile friction

* Landing too

* Optimise controllers

* Move CCVars and other stuff swept is beautiful

* Cleanup a bunch of controllers

* Fix shooting and high pressure movement controller

* Flashing improvements

* Stuff and things

* Combat collisions

* Combat mode collisions

* Pulling distance joint again

* Cleanup physics interfaces

* More like scuffedularity

* Shit's fucked

* Haha tests go green

* Bigmoneycrab

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Shared/Interfaces/GameObjects/Components/Interaction/IThrowCollide.cs

@@ -18,7 +18,7 @@ namespace Content.Shared.Interfaces.GameObjects.Components
         /// <summary>
         ///     The entity that threw <see cref="Thrown"/> and hit <see cref="Target"/>.
         /// </summary>
-        public IEntity User { get; }
+        public IEntity? User { get; }
 
         /// <summary>
         ///     The entity thrown by <see cref="User"/> that hit <see cref="Target"/>
@@ -29,14 +29,12 @@ namespace Content.Shared.Interfaces.GameObjects.Components
         ///     The entity hit with <see cref="Thrown"/> by <see cref="User"/>
         /// </summary>
         public IEntity Target { get; }
-        public EntityCoordinates Location { get; }
 
-        public ThrowCollideEventArgs(IEntity user, IEntity thrown, IEntity target, EntityCoordinates location)
+        public ThrowCollideEventArgs(IEntity? user, IEntity thrown, IEntity target)
         {
             User = user;
             Thrown = thrown;
             Target = target;
-            Location = location;
         }
     }
 
@@ -50,7 +48,7 @@ namespace Content.Shared.Interfaces.GameObjects.Components
         /// <summary>
         ///     The entity that threw <see cref="Thrown"/>.
         /// </summary>
-        public IEntity User { get; }
+        public IEntity? User { get; }
 
         /// <summary>
         ///     The entity thrown by <see cref="User"/> that hit <see cref="Target"/>
@@ -61,14 +59,12 @@ namespace Content.Shared.Interfaces.GameObjects.Components
         ///     The entity hit with <see cref="Thrown"/> by <see cref="User"/>
         /// </summary>
         public IEntity Target { get; }
-        public EntityCoordinates Location { get; }
 
-        public ThrowCollideMessage(IEntity user, IEntity thrown, IEntity target, EntityCoordinates location)
+        public ThrowCollideMessage(IEntity? user, IEntity thrown, IEntity target)
         {
             User = user;
             Thrown = thrown;
             Target = target;
-            Location = location;
         }
     }
 }