Fix outline encryption

[Lucas-C]

Fix #732

Also introduces a new PDF object type: PDFDate

[codecov]

Codecov Report

Patch coverage: 92.50% and no project coverage change.

Comparison is base (aba7409) 93.06% compared to head (cd78ca2) 93.07%.

❗ Current head cd78ca2 differs from pull request most recent head 97807b4. Consider uploading reports for the commit 97807b4 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #734   +/-   ##
=======================================
  Coverage   93.06%   93.07%           
=======================================
  Files          26       26           
  Lines        7128     7134    +6     
  Branches     1280     1278    -2     
=======================================
+ Hits         6634     6640    +6     
  Misses        308      308           
  Partials      186      186           

Impacted Files	Coverage Δ
fpdf/util.py	62.83% <ø> (-3.03%)	⬇️
fpdf/syntax.py	89.18% <86.95%> (+1.68%)	⬆️
fpdf/actions.py	89.79% <100.00%> (-1.44%)	⬇️
fpdf/annotations.py	98.64% <100.00%> (ø)
fpdf/encryption.py	96.27% <100.00%> (+0.06%)	⬆️
fpdf/fpdf.py	91.84% <100.00%> (ø)
fpdf/outline.py	100.00% <100.00%> (ø)
fpdf/output.py	96.63% <100.00%> (-0.03%)	⬇️

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