- Added `cond` attribute which allows for conditional parsing or skipping of a field

- Added `id_pat` attribute which allows pattern matching for enum variants

Community:

- Added `ctx` attribute which adds the ability to pass context to child parsers from the parent ([@constfold](https://github.com/constfold))

- Internal refactoring of `endian`, `bits` and `count` attributes, they are now sugar around the `ctx` ([@constfold](https://github.com/constfold))

- Renamed `to_bitvec` to `to_bits` ([@wcampbell0x2a](https://github.com/wcampbell0x2a))