Unify header files

src/contrib/base32hex.h

src/contrib/base64.h

src/contrib/dnstap/convert.h

src/contrib/dnstap/dnstap.h

src/contrib/dnstap/message.h

src/contrib/dnstap/reader.h

src/contrib/dnstap/writer.h

src/contrib/dynarray.h

src/contrib/getline.h

src/contrib/macros.h

src/contrib/mempattern.h

src/contrib/string.h

src/contrib/tolower.h

src/contrib/trim.h

src/knot/conf/base.h

src/knot/conf/conf.h

src/knot/conf/confdb.h

src/knot/conf/confio.h

src/knot/conf/schema.c

src/knot/conf/schema.h