Type-annotate and fix datalad/support/strings.py

[jwodder]

Part of #6884.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -78.77 ⚠️

Comparison is base (6c42103) 88.61% compared to head (e0acb7e) 9.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##            maint   #7318       +/-   ##
==========================================
- Coverage   88.61%   9.84%   -78.77%     
==========================================
  Files         326     326               
  Lines       44441   43918      -523     
  Branches     5919       0     -5919     
==========================================
- Hits        39381    4325    -35056     
- Misses       5045   39593    +34548     
+ Partials       15       0       -15     

Impacted Files	Coverage Δ
datalad/support/strings.py	0.00% <0.00%> (-86.96%)	⬇️
datalad/coreapi.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/cli/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/local/unlock.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/cli/interface.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/support/param.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/local/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/cli/common_args.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/support/digests.py	0.00% <0.00%> (-100.00%)	⬇️
datalad/tests/test_misc.py	0.00% <0.00%> (-100.00%)	⬇️
... and 286 more

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[yarikoptic]

Filed #7230 for the appveyor failure -- not related.

[yarikoptic]

will merge monday unless there is reservartions

[yarikoptic-gitmate]

PR released in 0.18.3