Remove material cache, some materials seem not work when cloned #2255
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I just could not figure out why the material cloning doesn't work. I mean, AssetManager does it all the time... I don't know. Anyway, this slows down 20% loading the Bistro scene as GLB on my beefy computer. However, the memory problems are still solved with the texture cache.
Partially reverts #2128. But as said, the memory fix is still in and working.
As discussed in https://hub.jmonkeyengine.org/t/jmonkeyengine-v3-7-feature-freeze/47558/35.