Mdfix

[tlienart]

closes #205 and #206 with proper handling of

• backslashes including the special \\ which, as in LaTex, forces a line return
• escaping of backtick doesn't error anymore
• usage of html entities now works

(also moderate clean up of some tests, introduction of explore_md_steps and explore_h_steps to cleanly explore what's being done in the respective parsing steps at test time)

[codecov]

Codecov Report

Merging #209 into master will decrease coverage by 0.1%.
The diff coverage is 88.46%.

@@            Coverage Diff             @@
##           master     #209      +/-   ##
==========================================
- Coverage   87.03%   86.92%   -0.11%     
==========================================
  Files          26       28       +2     
  Lines        1118     1132      +14     
==========================================
+ Hits          973      984      +11     
- Misses        145      148       +3

Impacted Files	Coverage Δ
src/JuDoc.jl	100% <ø> (ø)	⬆️
src/migration/jekyll.jl	0% <0%> (ø)
src/converter/md_blocks.jl	96.77% <100%> (ø)	⬆️
src/converter/md.jl	98.11% <100%> (+0.01%)	⬆️
src/converter/md_utils.jl	100% <100%> (ø)	⬆️
src/parser/md_tokens.jl	100% <100%> (ø)	⬆️
src/parser/tokens.jl	98.14% <87.5%> (-1.86%)	⬇️
src/parser/md_chars.jl	88.88% <88.88%> (ø)
src/converter/lx.jl	95.57% <0%> (-0.04%)	⬇️
... and 1 more

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