👌 Add option for footnotes references to always be matched

[chrisjsewell]

Usually footnote references are only matched when a footnote definition of the same label has already been found. If always_match_refs=True, any [^...] syntax will be treated as a footnote.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.72727% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.80%. Comparing base (7762458) to head (635677c).
Report is 3 commits behind head on master.

Files	Patch %	Lines
mdit_py_plugins/footnote/index.py	97.72%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   92.68%   92.80%   +0.12%     
==========================================
  Files          31       31              
  Lines        1817     1835      +18     
==========================================
+ Hits         1684     1703      +19     
+ Misses        133      132       -1     

Flag	Coverage Δ
pytests	92.80% <97.72%> (+0.12%)	⬆️

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