Add option to allow raw encryption.

[ni4]

This would allow encryption of the already signed message via FFI and CLI.
Fixes #1795

[codecov]

Codecov Report

Merging #1807 (6944d43) into master (23a440b) will decrease coverage by 0.00%.
The diff coverage is 83.72%.

❗ Current head 6944d43 differs from pull request most recent head c12d6a5. Consider uploading reports for the commit c12d6a5 to get more accurate results

@@            Coverage Diff             @@
##           master    #1807      +/-   ##
==========================================
- Coverage   81.14%   81.14%   -0.01%     
==========================================
  Files         138      138              
  Lines       28770    28777       +7     
==========================================
+ Hits        23346    23350       +4     
- Misses       5424     5427       +3     

Impacted Files	Coverage Δ
src/librepgp/stream-ctx.h	100.00% <ø> (ø)
src/rnp/fficli.cpp	76.47% <0.00%> (-0.10%)	⬇️
src/tests/ffi-enc.cpp	82.64% <76.47%> (-0.36%)	⬇️
src/lib/rnp.cpp	78.66% <80.00%> (+<0.01%)	⬆️
src/librepgp/stream-write.cpp	76.96% <89.58%> (+0.09%)	⬆️
src/rnp/rnp.cpp	79.07% <100.00%> (+0.30%)	⬆️
src/rnp/rnpcfg.cpp	79.51% <0.00%> (-0.98%)	⬇️

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[antonsviridenko]

"No wrap" looks ambiguous, maybe "--no-literal-data-packet" or something more explicit and meaningful?

[ni4]

"No wrap" looks ambiguous, maybe "--no-literal-data-packet" or something more explicit and meaningful?

That one is too long as for me. I was guided by GnuPG's --unwrap key. Basically, user should not know details of the underlying process, just understand why this command is could be usefull for him, so easier wording could be beneficial. But still good subject to discuss )

[ronaldtse]

Thank you @ni4 @andrey-utkin !