feat: remove scene update deletions to test

[aneuwald-ctw]

As commented on issue #111, I tested OSI converter with not scene update deletions and I found a significant improvement of performance with no change on the visualization. Could youn guys validate it?

Obs.: This PR was not created with intention of merge, more to share modifications that could potentially improve performance.

[thomassedlmayer]

As discussed in #111 removing the deletion code is not possible due to the delta-based rendering of Lichtblick in combination with the stateless interface of OSI. For stateless interfaces like OSI, extensions always have to implement their own logic to delete objects that disappear from one frame to the next as long as this is not supported natively by Lichtblick.

Though, in #113 I removed and fixed the buggy code that adds lots of unnecessary deletions in every time step.

@jdsika I think we can close this PR. @aneuwald-ctw Thanks again for the hint to the bug.

[jdsika]

Thank you for helping with the performance improvements!