[NRRPLT-8035] Revert the new colladaloader.js code

* Revert "Merged in NUIT-221-some-models-dont-show-up (pull request #293)"

This reverts commit b5493dee.

* Merged development into NRRPLT-8035

* Merge branch 'development' into NRRPLT-8035

Approved-by: Ugo Albanese
Approved-by: Sandro Weber