Proof reading

[ClemensLinnhoff]

Collection of small fixed that need to be done before release:

• Radiometric profile format still needs to be defined: https://github.com/asam-ev/OpenMATERIAL-3D/blob/main/schemas/asset_schema.json#L380
• emissive_texture and masking_texture should have _uri suffix as all other uri propertes in OpenMATERIAL 3D: https://github.com/asam-ev/OpenMATERIAL-3D/blob/main/schemas/asset_schema.json#L481C21-L490C23
• Description of geometryProperties.node needs to be rephrased to singular (properties -> property) as the node is defined per property and not for all: https://github.com/asam-ev/OpenMATERIAL-3D/blob/main/schemas/asset_schema.json#L531
• externalAssetReferences.external_asset should have _uri suffix as all other uri propertes in OpenMATERIAL 3D and it should be of json type uri: https://github.com/asam-ev/OpenMATERIAL-3D/blob/main/schemas/asset_schema.json#L355