Move redaction decoding

[pieterlouw]

I'm moving the decoding of redactions specified in json format to a package function for 2 reasons:

• If pqstream is used as a library one can send redactions in JSON as well
• Clean up pqsd.main

[tmc]

I like this, can you check on the build?

[pieterlouw]

Strange. I'm not sure why the build is giving problems - my local build works fine.

[codecov[bot]]

Codecov Report

Merging #74 into master will decrease coverage by 0.22%. The diff coverage is 60%.

@@            Coverage Diff             @@
##           master      #74      +/-   ##
==========================================
- Coverage   69.19%   68.96%   -0.23%     
==========================================
  Files           3        3              
  Lines         198      203       +5     
==========================================
+ Hits          137      140       +3     
- Misses         33       34       +1     
- Partials       28       29       +1

[tmc]

Thanks @pieterlouw !