Openmw 48 stereo fixes

Mads Buvik Sandveirequested to merge
madsbuvi/openmw:openmw-48-stereo-fixes into openmw-48

This MR contains some stereo fixes that were made in the VR fork but didn't get an MR upstream yet.

  • Updates osg multiview changeset to d2ee5aa8 which includes multiview-specific fixes, as well as the missing dll osgdb_dae.dll
  • Updates stereo matrix multiplication to model * (view * stereo) * projection from model * view * (stereo * projection as the latter produces FP errors.
  • Fixes a bug where SkyStereoStatesetUpdater was always requesting reverseZ matrices, breaking the sky in stereo when reverseZ=false

@AnyOldName3 can you verify if this fixes #7232 (closed) ?

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