CLI: add command --set-filename and do not store env/stdin filename in message

[ni4]

• fixes #1843
• adds --set-filename command to override file name in the literal data packet.

[codecov[bot]]

Codecov Report

Base: 81.79% // Head: 81.79% // Decreases project coverage by -0.00% :warning:

Coverage data is based on head (906174f) compared to base (2677cf0). Patch coverage: 86.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1922      +/-   ##
==========================================
- Coverage   81.79%   81.79%   -0.01%     
==========================================
  Files         140      140              
  Lines       29044    29058      +14     
==========================================
+ Hits        23757    23768      +11     
- Misses       5287     5290       +3     

Impacted Files	Coverage Δ
src/rnp/fficli.cpp	81.14% <83.33%> (-0.04%)	:arrow_down:
src/rnp/rnp.cpp	80.55% <100.00%> (+0.20%)	:arrow_up:
src/common/file-utils.cpp	94.23% <0.00%> (-1.93%)	:arrow_down:
src/tests/ffi.cpp	86.29% <0.00%> (ø)
src/lib/pgp-key.cpp	84.51% <0.00%> (+0.03%)	:arrow_up:

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[antonsviridenko]

All debian tests failed on

247 - cli_tests-Misc (Failed)

[ni4]

@antonsviridenko Thanks, now it should go fine...