[Cin] some cleanups, adding ffmpeg script from mail archive

3 Nov 2022

      Using old thread

https://lists.cinelerra-gg.org/pipermail/cin/2019-May/000671.html

I added vaapi proxying script to our doc/ directory (really not fan of
retyping scripts from manual ...)

and removed near-empty "whats new" from 2.1 era

and removed few 'sav' backup copies from tree

and moved old 1.1.0 release notes and TODOs from svn era into new old/
directory.

see if you like those changes, apply accordingly!

[Cin] some cleanups, adding ffmpeg script from mail archive

Andrew Randrianasulu