Jolt soft body support

[josephrocca]

Since Jolt now has soft body support, it'd be neat if Phy had support too:

• Soft body support jrouwe/JoltPhysics#390 (comment)

There are some caveats to the current implementation though - e.g. soft bodies can only collide with rigid bodies (not other soft bodies, and I'm guessing soft body self-collision is not supported either, but just a guess).

Maybe with all the caveats listed in the linked comment it is too early to add to Phy, but I guess it might be handy to have this tracking issue for it anyway.

[lo-th]

yes i have to try
i have good method for ammo
but physx havok and oimo
don't have soft body
is possible to make soft body with joint
i''m on demo about that

also softbody is generally heavy
thank for your support