Remove autotools build + abandoned vagrant + mediainfo + codecanalyzer tools

gstreamer-project#42 (closed)

commit ca260bd8:

vagrant: remove

This looks bitrotten and still targets Ubuntu 13.10
and autotools. Doesn't look like anyone has been using
this in the last 5+ years, so let's remove it in an
effort to declutter.

commit ef9a57d3:

mediainfo: remove

This looks bitrotten and abandoned,
remove in an effort to declutter.

commit ea2b8a2e:

codecanalyzer: remove

Remove in effort to declutter. There has been
pretty much no activity at all since the initial
commit in 2014 apart from a few coverity fixes.
Doesn't seem super-useful in its current form
either. Still available on github at
https://github.com/sreerenjb/codecanalyzer/
if anyone has a use for it.

commit 280321de:

validate: remove autotools build