Reorganize code and reduce header dependencies #4638
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Preprocessing each source file and counting the non-empty lines (see script in this PR), compiling libbotan involves the compiler looking at roughly 38 million lines of code (!). Changes here bring it down to a bit under 35 million.
Still not great tbh, and I think reducing compile times could use more focus.
This ignores the tests for now, I expect they could see similar improvement.