Introduce a mode to suppress all warnings

[isidentical]

• Suppress all python level warnings with -qq

Resolves #1271.

[codecov-commenter]

Codecov Report

Merging #1283 (fb55f8b) into master (4d7d6b6) will decrease coverage by 0.61%.
The diff coverage is 95.43%.

@@            Coverage Diff             @@
##           master    #1283      +/-   ##
==========================================
- Coverage   97.28%   96.66%   -0.62%     
==========================================
  Files          67       85      +18     
  Lines        4235     6061    +1826     
==========================================
+ Hits         4120     5859    +1739     
- Misses        115      202      +87     

Impacted Files	Coverage Δ
tests/test_binary.py	100.00% <ø> (ø)
httpie/compat.py	31.11% <27.90%> (-68.89%)	⬇️
tests/conftest.py	77.14% <58.33%> (-9.82%)	⬇️
tests/test_ssl.py	91.01% <66.66%> (-3.93%)	⬇️
httpie/manager/__main__.py	82.35% <82.35%> (ø)
httpie/output/lexers/metadata.py	82.35% <82.35%> (ø)
httpie/output/lexers/http.py	86.36% <86.36%> (ø)
httpie/models.py	94.23% <90.00%> (-3.14%)	⬇️
tests/test_uploads.py	97.70% <92.59%> (-2.30%)	⬇️
httpie/manager/core.py	92.85% <92.85%> (ø)
... and 71 more

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