exposing transform parameters in Physx component

[yinchy]

It would be useful to be able to change the scaling (and maybe even the translation and rotations) of a physx component from code.
This is especially important for convexMesh and triangleMesh instances

This would allow for easier dynamic configuration of different instances of physics objects at runtime.

[yinchy]

It appears that scaling for convexMesh can be set with the extents field

Would be useful to have access the translation and rotation fields somehow as well