Physics,scene Bug fixes

[CedricGuillemet]

• Bug fix https://forum.babylonjs.com/t/inspector-bug-with-wireframe-not-being-aligned-on-mesh/29021/10
  Clone for wireframe mesh was also cloning physics impostor. And the impostor having a delta rotation, it was applied twice (parent's delta + delta) causing invalid rendering
• Bug fix https://forum.babylonjs.com/t/physicsimpostor-ignoreparent-causes-crash/29194/4
• scene skipPointerDownPicking : do not pick ray in scene when not appropriate. This is causing massive performance drop on native.

[azure-pipelines]

Please make sure to tag your PR with "bug", "new feature" or "breaking change" tags.

[azure-pipelines]

Snapshot stored with reference name:
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To test the snapshot in the playground itself use (for example):

https://playground.babylonjs.com/?snapshot=refs/pull/12374/merge#BCU1XR#0

[azure-pipelines]

Please make sure to tag your PR with "bug", "new feature" or "breaking change" tags.

[azure-pipelines]

Snapshot stored with reference name:
refs/pull/12374/merge

Test environment:
https://babylonsnapshots.z22.web.core.windows.net/refs/pull/12374/merge/index.html

To test a playground add it to the URL, for example:

https://babylonsnapshots.z22.web.core.windows.net/refs/pull/12374/merge/index.html#WGZLGJ#4600

To test the snapshot in the playground itself use (for example):

https://playground.babylonjs.com/?snapshot=refs/pull/12374/merge#BCU1XR#0

[deltakosh]

@CedricGuillemet When is skipPointerDownPicking supposed to be true?

[CedricGuillemet]

@deltakosh any time you don't need (CPU intensive) picking : game, viewer, demo, ...
For example, on native I drop from 60FPS to 8FPS with space demo. picking in non-JIT is very expensive. It's also expensive on the web.
another case here : BabylonJS/BabylonReactNative#387

[deltakosh]

Makes sense!