👌 Improve field lists

[chrisjsewell]

This introduces better handling of the field list body content, so that it can be dynamically indented (the same as in rST).

Before, one could only indent like:

:name1: first line
              
        all other lines must be aligned with it

:name2:
  
  no first line so 2 space indent

But now, the indentation will be taken as the minimum of all content, e.g.

:name1: first line

 this is indented 1, so all content will follow this

[codecov]

Codecov Report

Base: 92.76% // Head: 92.87% // Increases project coverage by +0.11% 🎉

Coverage data is based on head (83ac21e) compared to base (9e57524).
Patch coverage: 97.77% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
+ Coverage   92.76%   92.87%   +0.11%     
==========================================
  Files          30       30              
  Lines        1673     1699      +26     
==========================================
+ Hits         1552     1578      +26     
  Misses        121      121              

Flag	Coverage Δ
pytests	92.87% <97.77%> (+0.11%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mdit_py_plugins/field_list/__init__.py	95.96% <97.77%> (+1.06%)	⬆️

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