[Cin] selectable vaapi decoder device

[Phyllis Smith]

Andrea, checked into GIT.  That is a "cute" mirror.png image! It reads good
for me and I only made 1 minor change changing "i.e." to "that is" -- I
always worry about users who may be confused by the i.e. if translating
from english.

I append manual plugins.tex, image and mirror.txt, for those who want
> to read the description but don't have latex. Please propose
> corrections and improvements, thank you.
>
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