Remove framedelay

[tebjan]

This PR improves two things:

• The shadow data is retrieved in the same frame in the draw call before drawing the shadow catcher
• The custom scene nodes aren't necessary because the show maps can be retrieved from the RenderContext in the draw call too

[tebjan]

Ready for merging from my end. But please review it to ensure it still functions correctly...

[torinos-yt]

Merged. It seems to be working correctly at hand. Thanks for the great PR!. I still don't know much about stride :D

[tebjan]

It looks impressive what you did with the shadow maps and reflection, it shows deep insight. Using the render context as information storage isn't documented anywhere, so it is super hard to find. Now you know it :)