fix: add optional render handle field to VertexLayout
fix: add optional render handle field to VertexLayout

zenmumbler/stardazed-tx,stardazed/stardazed-tx,zenmumbler/stardazed-tx,stardazed/stardazed-tx,stardazed/stardazed,stardazed/stardazed-tx,zenmumbler/libzm,zenmumbler/libzm,zenmumbler/libzm,zenmumbler/stardazed-tx,zenmumbler/stardazed-tx,stardazed/stardazed,zenmumbler/libzm