Split AutoDoc, move most of it to AutoDoc_INTERN; refactor AutoDocWorksheet to call AutoDoc_INTERN

[fingolfin]

• Split AutoDoc, move most of it to AutoDoc_INTERN
• Refactor AutoDocWorksheet to call AutoDoc_INTERN

[codecov]

Codecov Report

❌ Patch coverage is 82.60870% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.09%. Comparing base (5895675) to head (6c52995).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
gap/AutoDocMainFunction.gi	78.94%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #366      +/-   ##
==========================================
- Coverage   93.19%   93.09%   -0.11%     
==========================================
  Files          13       13              
  Lines        2926     2926              
==========================================
- Hits         2727     2724       -3     
- Misses        199      202       +3     

Files with missing lines	Coverage Δ
gap/Magic.gd	100.00% <100.00%> (ø)
gap/Magic.gi	72.38% <100.00%> (-0.76%)	⬇️
gap/AutoDocMainFunction.gi	93.15% <78.94%> (-0.29%)	⬇️

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