[wip] emit styles

[biojppm]

re #37

[codecov]

Codecov Report

Merging #191 (f702535) into master (bd4f2c1) will decrease coverage by 0.17%.
The diff coverage is 93.26%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
- Coverage   96.83%   96.65%   -0.18%     
==========================================
  Files          74       75       +1     
  Lines       15355    15806     +451     
==========================================
+ Hits        14869    15278     +409     
- Misses        486      528      +42     

Impacted Files	Coverage Δ
test/test_block_literal.cpp	100.00% <ø> (ø)
test/test_case.hpp	46.90% <ø> (ø)
src/c4/yml/emit.def.hpp	88.86% <85.80%> (-7.21%)	⬇️
test/test_emit.cpp	99.14% <99.14%> (ø)
src/c4/yml/emit.hpp	100.00% <100.00%> (ø)
src/c4/yml/node.hpp	97.54% <100.00%> (ø)
src/c4/yml/tree.hpp	98.61% <100.00%> (+0.06%)	⬆️
test/test_case.cpp	87.01% <100.00%> (-0.11%)	⬇️
test/test_null_val.cpp	100.00% <100.00%> (ø)
test/test_suite.cpp	96.47% <100.00%> (ø)
... and 8 more

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[captain-yoshi]

Just giving feedback for _WIP_STYLE_FLOW_SL:

_WIP_STYLE_FLOW_SL = c4bit(14), ///< mark container with single-line flow format (seqs as '[val1,val2], maps as '{key: val, key2: val2}')

// Is this an error ? There should be a space between values like for the map. '[val1, val2]'

You could even have these 2 styles :

# _WIP_STYLE_FLOW_SL
[val1, val2]

# _WIP_STYLE_FLOW_SL_COMPACT
[val1,val2]