[OSI Harmonization] Add Ambient Illumination to class Weather
Describe the feature
The OSC Weather and OSI Environmental Conditions are not yet harmonized completely. In OSI there is an ambient illumination as enum value: https://opensimulationinterface.github.io/osi-antora-generator/asamosi/latest/gen/structosi3_1_1EnvironmentalConditions.html#a9af62398fb21a5314539815afa733d4b This is still missing in OSC.
Describe the solution you would like
- Add an attribute "ambient illumination" to OSC Weather struct.
- The unit should be a double, so we have a precise value, which can be mapped to the OSI ambient illumination levels enum.
Describe alternatives you have considered
none.
Describe the backwards compatibility
Backward compatible because new optional attribute is added.