Resolve clipPaths via stylesheet

[swhitty]

Fixes #94

Previously clip-path was only read form element attributes clip-path="url(#cp)" or style tags style: clip-path: url(#cp) but were never resolved via a Stylesheet.

This PR corrects that and will resolve clip paths referenced by the current class / id / selector

.a {
   clip-path: url(#cp)
}

<g class="a"> 
   ...
</g>

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.76%. Comparing base (5886ae2) to head (f2cb554).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
+ Coverage   89.74%   89.76%   +0.01%     
==========================================
  Files         144      144              
  Lines       12351    12366      +15     
==========================================
+ Hits        11085    11100      +15     
  Misses       1266     1266              

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