Various improvements

Updates as follows:

• Patch three-to-ammo to not use getInverse() (deprecated in A-Frame 1.4.0)
• Fix tests that were broken by move to package lock v2
• Extend examples so that each example is available for each of Ammo, Cannon & Cannon Worker (some Cannon Worker examples don't work)
• Performance example (balls rolling down a pinboard)
• Performance statistics for both Cannon & Ammo drivers
• Performance improvements for Ammo driver (don't update static entity positions every frame, guidance on performance impact of fit:all)

Back compatibility:

• For performance reasons, the Ammo driver no longer updates static object positions to the physics engine every tick. See docs for more detail.