Added fog as rendering options.

[perminder-17]

issue : OpenChemistry/avogadrolibs#347
signed-off by: [email protected]
complimentary to : OpenChemistry/avogadrolibs#1672
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[perminder-17]

The file was not formatted actually as per my vs code formatter. Also, this file may have merge conflicts with the blur one. So, after merging any of the PR, I will resolve the merge conflicts in other file.

[welcome]

Congrats on merging your first pull request! 🎉 Thanks for making Avogadro better for everyone!