viewBox now accepts comma delimited values

[swhitty]

updates parsing of viewBox to accept comma delimited values

<svg width="256" height="256" viewBox="0,0,32,32">

Fixes #137

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.79%. Comparing base (a5da29f) to head (40bef1c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
+ Coverage   88.78%   88.79%   +0.01%     
==========================================
  Files         166      166              
  Lines       13311    13326      +15     
==========================================
+ Hits        11818    11833      +15     
  Misses       1493     1493              

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