Fetch pybind through cmake

Removes pybind from 3rdParty folder and instead fetches it during build as discussed in #106 (closed)

changed title from Fetch pybind through make to Fetch pybind through cmake

@soe.peters I don't think I can assign someone, could you have a look?

I added a few comments. Many thanks, that you have addressed this so quickly. The advantage that you can now easily test another version of pybind is great.

requested review from @soe.peters

added 1 commit

• 865238d3 - reverts !f99a64f4

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added 1 commit

• 8846e880 - use FetchContent_MakeAvailable instead of find_package

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mentioned in commit e5ed4e5d

merged