* Move -m and -n command line options into the config file
* Restructure configuration file:
- Group into "server", "stream", "media", "metadata", "decoders", and
"encoders"
- Untangle decoder and encoder:
o Decoders match on file extensions and convert to a canonical "internal"
format
o Encoders create one of the supported stream formats, potentially using
different parameters (like bitrate)
- Consistently specify stream format
- Enable reencoding by selecting an encoder
* Architecturally separate configuration file storage from parsing
- Allows for different configuration back-ends in the future, like
YAML, SQL, REST API, ...
* Support roll-back in case of error on (re)load
* Anticipate HTTPS support
The libxalloc was reincarnated long ago in a separate utility library.
It did a good job help make ezstream have robust memory management years ago,
but now it's time to move on and get back to basics.
The replacement introduces reallocarray(), which is an overflow-checking
alternative to both malloc (NULL ptr) and realloc().
