"tonemapping"/colors issues for some demos

[abernier]

https://discourse.threejs.org/t/updates-to-color-management-in-three-js-r152/50791

list all <r152 and upgrade them

TODO: list them here

[rndexe]

I feel there are other lighting related changes as well such as in arkanoid-under-60-loc which are not related to tonemapping.

In general things are a bit darker and colors appear more dull.

[krispya]

The lighting model changed. To get lights to be about the same intensity you take the old value and multiply by PI.