This also renames variables to be easier to understand (rather than
copying the naming scheme of the spec) and moves the calculation of
computable fields in the wave format header into the adpcm module.
Error where truncation can occurr and prevent truncation in the future
by using `type::from()` (which checks for truncation) instead of `as
type` (which doesn’t).
The reason for the switch is mostly related to error handling (and me
being unable to unterstand how nom does it). Using byteorder and a few
handwritten helper functions for parsing makes error handling much
easier. It also allows me to return more helpful error messages.
Simon Bruder