Merge branch 'public-libs-common' into 'master'
Moved common/ to libknot/internal/ 2nd step in separating libknot into an independent library. As we agreed, I moved all files from `common/` to `libknot/internal/`. Also some renaming was done: symbols in `libknot/internal/` should not be prefixed with `knot_` unless they are system symbol replacements. Unified the prefixing of `namedb` symbols. Fixes #305 Following: #301 See merge request !303
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