Mask out shadows on CanvasItems that don't have a matching item_shadow_mask
#98835
+200
−175
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Fixes: #64939
Fixing this required a small amount of refactoring to move some of the per-instance flags into a new per-batch flag. This was needed to free up the required 16 bits for the shadow mask. We do the actual masking on the CPU and then just store a binary value for whether that lights shadow impacts that CanvasItem. This saves instructions in the shader.