export v2: Automatically minify output

[victorlin]

Description of proposed changes

Automatically format the output JSON file based on the number of tips, unless either --minify-json or --no-minify-json (new option) is specified.

Snippet of updated help output:

OPTIONAL SETTINGS:
  --minify-json         export JSONs without indentation or line returns,
                        regardless of how many nodes are in the tree.
                        (default: False)
  --no-minify-json      export JSONs to be human readable, regardless of how
                        many nodes are in the tree. (default: False)

Related issue(s)

• export: Automatically minify JSON #1331

Checklist

• Checks pass
• If making user-facing changes, add a message in CHANGES.md summarizing the changes in this PR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b3dfbec) 66.14% compared to head (ab0f7bf) 66.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1352      +/-   ##
==========================================
+ Coverage   66.14%   66.23%   +0.08%     
==========================================
  Files          68       68              
  Lines        7225     7238      +13     
  Branches     1777     1780       +3     
==========================================
+ Hits         4779     4794      +15     
+ Misses       2177     2176       -1     
+ Partials      269      268       -1     

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[corneliusroemer]

I'm happy with this, where to set the default I don't mind so much, this isn't blocking for me as it can be changed easily.

[jameshadfield]

Looks good by inspection. UTF-8 does not use one byte all the time, it's 1 to 4 bytes, but for this purpose I think using characters and bytes interchangeably is ok.

[victorlin]

@jameshadfield oh, good point! I'll push a fix to account for that.

EDIT: pushed 50e71a3