Update Boost to 1.84.0, 1.85.0 and 1.86.0 #775
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step by step carefully. Yes
Some toolchains are broken. The used toolchains should be probably be updated at some time, because most of them are quite old.
I used the commits from the PRs #758 and #759 in order to update the boost versions. In separate commits I have made the necessary change in order to support the newer libs.
Boost::process for v2 became now a library. Because of this I moved the examples to a different folder.
I am a bit unsure about boost::predef. It is listed as a lib, does not seem to be built as a lib. I have added it as a lib because otherwise it would be "built" for each boost module.
I did not update to boost 1.87.0 because it was further modularized and need more work.