add url datatype for attributes that should be restricted to HTTP/HTTPS

[alexskr]

Restrict attributes that are used for rendering links or pulling remote files needs to be restricted to urldatatype, which limits URIs to HTTP/HTTPS

:homepage, :documentation, :pullLocation

see:

• Feature: :url data type validation for restricting URIs to http schema goo#169
• Add :url Validator to Enforce HTTP/HTTPS URI Schemes Only goo#164

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.21%. Comparing base (573a5b0) to head (a406952).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #258      +/-   ##
===========================================
- Coverage    80.23%   80.21%   -0.03%     
===========================================
  Files           84       84              
  Lines         5874     5873       -1     
===========================================
- Hits          4713     4711       -2     
- Misses        1161     1162       +1     

Flag	Coverage Δ
unittests	80.21% <100.00%> (-0.03%)	⬇️

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