Add missing IPhysicsObject methods

[jcwik223]

I'm currently working on some projects that heavily involve physics objects (portal-esque gun, Lua grav and physguns) and I'm a bit stuck without a few of these methods. I put the more important ones at the top.

// AddAngleVelocity seems to treat the addition as an applicative force and is not set immediately which is why I'm guessing the Instantaneous version exists

• [ ] SetAngleVelocity (2nd arg of ::SetVelocity)
• [ ] SetAngleVelocityInstantaneous (2nd arg of ::SetVelocityInstantaneous)
• [x] ApplyTorqueCenter (for rotational kinematics on an arbitrary point instead of general rotation)
• [x] GetShadowPosition (used by gravgun in simulating motion on a held object)
• [x] GetVelocityAtPoint (can be used to find a close frictional force estimate)
• [ ] Get/SetCallbackFlags (need CALLBACK_GLOBAL_TOUCH_STATIC for an NPC)
• [ ] GetSphereRadius (can be used to see if spherical physobjs are inside one another)
• [ ] SetShadow (like UpdateShadow but will maintain the current position/angle data while only updating speed and physics behavior)

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• [x] Get/SetContents (setting what a physobj is made of can allow entities to have complex collision behavior depending on each physobj)
• [ ] Get/SetGameData (usually used to link constraint physobjs to the entity being constrained, which has some internal optimization properties in regards to sleeping and collision)
• [ ] Get/SetGameFlags (used to disable physobj self-collisions, pickup ability and a number of other things; see FVPHYSICS flags)
• [ ] IsHinged/BecomeHinged/RemoveHinged (can be used to isolate object to one axis of movement)
• [ ] CalculateLinearDrag/CalculateAngularDrag
• [ ] IsStatic/IsFluid/IsTrigger (telling the physics object type for exact recreation)
• [ ] IsAttachedToConstraint

[thegrb93]

Yes. Torque is so needed. The current method is probably 100x slower.

[Kefta]

Related to https://github.com/Facepunch/garrysmod-requests/issues/944

[robotboy655]

Added PhysObj.ApplyTorqueCenter( Vector/AngularImpulse ) Added PhysObj.GetShadowPos() = Vector Added PhysObj.GetShadowAngles() = Angle Added PhysObj.GetVelocityAtPoint( Vector ) = Vector Added PhysObj.SetContents( uint ) Added PhysObj.GetContents() = uint