Replace library 'Clara' with 'Lyra'

[utilForever]

Recently, I found that the library 'Clara' (https://github.com/catchorg/Clara) is no longer maintained.
It has been forked and maintained as the new name 'Lyra' (https://github.com/bfgroup/Lyra).
We should replace it to maintain dependency.

[doyubkim]

Thanks for reporting this. Regarding the 3rd party dependencies, I am actually considering switching from the submodule approach to Conan package manager. I can find Lyra in conan-center as well as all the other dependencies. What do you think?

[utilForever]

That's a good idea. I'll switch to Conan, too. 😸