[WIP] FirstNode, unity update, structure trees updated

keyword "knowledge" is first node and has attribute global, or local.
structure trees were repaired accordingly
Configuration does not set global knowledge anymore
unity update
First tests done, french and chemistry works in their rooms.
Still to be tested completely.

Assets/AddressableAssetsData/AddressableAssetSettings.asset

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Assets/AssetStore/ClassRoom Stuff/Materials/Green_Board_Dif.mat

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@@ -41,9 +41,9 @@ Material:
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