Add shadow map generation for briefing #3509
Merged
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Currently, the model previews during the briefing did not calculate a shadow map. This means that the actual render stage used the last used shadowmap to render (in case of a mission play through the techroom, this is most likely the shadow of the ship shown by default in the ship viewer of the techroom). This is obviously just wrong and will lead to shadows completely unpredictable and wrong in the mission briefing.
This adds proper shadow calculation.
Code is essentially copied from the techroom