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Frozen materials and light update


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was messing with material freeze, and found behaviour that I haven't thought about. If material is set to `checkReadyOnlyOnce = true` inside babylon file, and lights are added after that material is ready. Light will not be added to material, what is logical as material is frozen. 

Here is PG with that behaviour. So in this case ,every time light is add / removed, switched of / on or animated I need to loop through all materials on scene and if  `checkReadyOnlyOnce = true` to force update using `markDirty()`. Just thinking if that could be done automatically by engine without breaking optimisation of freeze or its better to do on project side :)

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Also freezing a material is no more a big deal. We introduced several optimizations lately that could allow you to not freeze materials but still get the same perf

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