Migrate swig wrappers out to their individual modules

See the ./wrappers subdirectory for wrapper modules with an example in ./wrappers/example. Moved swig subdirectory to ./wrappers/old_swig, as it is no longer used in the build process, but is needed for further migration work and my be removed entirely after all modules are migrated into their own subdirectories
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Ok thx. We'll just leave it for now, until somebody wants to use the Perl binding.
We can't support everything anyway, and if nobody wants it there is no need for it.