Better default support for two-handed throws

[vabrador]

From a developer on our dev forums:

when one grasp is released, the object teleports/jumps to the other hand. Sometimes, when the other hand is also released right after the first you got an slingshot effect and the objct shoots away...

It's true; our throw controller doesn't support two-handed throws, and we have a bad edge-case where an object is thrown with a crazy velocity if the object is released just after a two-handed grasp is released. But we could support this better by default. It's a bit non-trivial, since it would take recognizing two-handed throws as a special case and overriding the default throw controller behavior, and it's not obvious where exactly this logic should happen.

[vabrador]

This issue should be addressed by the alternative two-handed grasp setting, MultiGraspHoldingMode, on the Interaction Manager, #1099.