This reverts commit b0ef65fc.
It's been nicer to read before, and static analysis can ignore this one.

... but keep it in cmdline.c (for now) to "follow the pattern".

Adds support for WebM/Matroska
Replaces Vorbis and Theora with Ogg

It's causing too much trouble in testing.

No more short-term plans, and it really should get out soon.

The correct way is to just not configure an encoder for a stream, which
is what the documentation already states. Encoder sections now require
a program name to be set or the configuration will not load.

Fixes a segfault in ezstream.c, as reported by Tom McCallum via Github.

Certain breakage in the example configurations can now be detected
automatically.