Prep new header structure

src/cbor/arrays.h

src/cbor/bytestrings.h

src/cbor/common.h

src/cbor/data.h

src/cbor/floats_ctrls.h

src/cbor/internal/builder_callbacks.h

src/cbor/internal/loaders.h

src/cbor/ints.h

src/cbor/maps.h

src/cbor/strings.h

src/cbor/tags.h