Add AUTODOC_ParseDate

[fingolfin]

Using code formerly in AUTODOC_FormatDate

[codecov]

Codecov Report

❌ Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.84%. Comparing base (5aee079) to head (2727b3d).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
gap/ToolFunctions.gi	90.90%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #294      +/-   ##
==========================================
+ Coverage   81.83%   81.84%   +0.01%     
==========================================
  Files          13       13              
  Lines        2174     2181       +7     
==========================================
+ Hits         1779     1785       +6     
- Misses        395      396       +1     

Files with missing lines	Coverage Δ
gap/ToolFunctions.gd	100.00% <100.00%> (ø)
gap/ToolFunctions.gi	92.82% <90.90%> (-0.29%)	⬇️

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