Speeds up interp quite a bit.
Also good as i've start to use more includes to make code easier to follow
where thigns come from and also makes jq-lsp happier.
Also rename evalContext to evalInstace to make it less confused with context.
Rename buffer to binary. Still some work left what to call buffer/binary in decode code.
Document decode value and binary type
Fix proper unit padding for tobytes and add still undocumenated extra padding argument.
Add some additional binary tests
Remove bitio.Buffer layer. bitio.Buffer was a kitchen sink layer with helpers
now it's just a buffer and most functions have been moved to decode instead.
bitio package now only have primitive types and functions simialar to standard
library io and bytes packages.
Make nearly eveything internally use bitio.Bit* interfaces so that slicing work
correctly this will also make it possible to start experimenting with more
complicated silcing helpers, ex things like:
breplace(.header.bitrate; 123) to get a new buffer with bitrate changed.
Was already handled in fq in various places as gojq uses them
Update msgpack to support negative integers that can't represented as int64
Rename read try* number functions to make them more explicit
